interesting researches in psychology

• The 25 Most Influential Psychological Experiments in History

While each year thousands and thousands of studies are completed in the many specialty areas of psychology, there are a handful that, over the years, have had a lasting impact in the psychological community as a whole. Some of these were dutifully conducted, keeping within the confines of ethical and practical guidelines. Others pushed the boundaries of human behavior during their psychological experiments and created controversies that still linger to this day. And still others were not designed to be true psychological experiments, but ended up as beacons to the psychological community in proving or disproving theories.

This is a list of the 25 most influential psychological experiments still being taught to psychology students of today.

1. A Class Divided

Study conducted by: jane elliott.

Study Conducted in 1968 in an Iowa classroom

Experiment Details: Jane Elliott’s famous experiment was inspired by the assassination of Dr. Martin Luther King Jr. and the inspirational life that he led. The third grade teacher developed an exercise, or better yet, a psychological experiment, to help her Caucasian students understand the effects of racism and prejudice.

Elliott divided her class into two separate groups: blue-eyed students and brown-eyed students. On the first day, she labeled the blue-eyed group as the superior group and from that point forward they had extra privileges, leaving the brown-eyed children to represent the minority group. She discouraged the groups from interacting and singled out individual students to stress the negative characteristics of the children in the minority group. What this exercise showed was that the children’s behavior changed almost instantaneously. The group of blue-eyed students performed better academically and even began bullying their brown-eyed classmates. The brown-eyed group experienced lower self-confidence and worse academic performance. The next day, she reversed the roles of the two groups and the blue-eyed students became the minority group.

At the end of the experiment, the children were so relieved that they were reported to have embraced one another and agreed that people should not be judged based on outward appearances. This exercise has since been repeated many times with similar outcomes.

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2. Asch Conformity Study

Study conducted by: dr. solomon asch.

Study Conducted in 1951 at Swarthmore College

Experiment Details: Dr. Solomon Asch conducted a groundbreaking study that was designed to evaluate a person’s likelihood to conform to a standard when there is pressure to do so.

A group of participants were shown pictures with lines of various lengths and were then asked a simple question: Which line is longest? The tricky part of this study was that in each group only one person was a true participant. The others were actors with a script. Most of the actors were instructed to give the wrong answer. Strangely, the one true participant almost always agreed with the majority, even though they knew they were giving the wrong answer.

The results of this study are important when we study social interactions among individuals in groups. This study is a famous example of the temptation many of us experience to conform to a standard during group situations and it showed that people often care more about being the same as others than they do about being right. It is still recognized as one of the most influential psychological experiments for understanding human behavior.

3. Bobo Doll Experiment

Study conducted by: dr. alburt bandura.

Study Conducted between 1961-1963 at Stanford University

In his groundbreaking study he separated participants into three groups:

• one was exposed to a video of an adult showing aggressive behavior towards a Bobo doll
• another was exposed to video of a passive adult playing with the Bobo doll
• the third formed a control group

Children watched their assigned video and then were sent to a room with the same doll they had seen in the video (with the exception of those in the control group). What the researcher found was that children exposed to the aggressive model were more likely to exhibit aggressive behavior towards the doll themselves. The other groups showed little imitative aggressive behavior. For those children exposed to the aggressive model, the number of derivative physical aggressions shown by the boys was 38.2 and 12.7 for the girls.

The study also showed that boys exhibited more aggression when exposed to aggressive male models than boys exposed to aggressive female models. When exposed to aggressive male models, the number of aggressive instances exhibited by boys averaged 104. This is compared to 48.4 aggressive instances exhibited by boys who were exposed to aggressive female models.

While the results for the girls show similar findings, the results were less drastic. When exposed to aggressive female models, the number of aggressive instances exhibited by girls averaged 57.7. This is compared to 36.3 aggressive instances exhibited by girls who were exposed to aggressive male models. The results concerning gender differences strongly supported Bandura’s secondary prediction that children will be more strongly influenced by same-sex models. The Bobo Doll Experiment showed a groundbreaking way to study human behavior and it’s influences.

4. Car Crash Experiment

Study conducted by: elizabeth loftus and john palmer.

Study Conducted in 1974 at The University of California in Irvine

The participants watched slides of a car accident and were asked to describe what had happened as if they were eyewitnesses to the scene. The participants were put into two groups and each group was questioned using different wording such as “how fast was the car driving at the time of impact?” versus “how fast was the car going when it smashed into the other car?” The experimenters found that the use of different verbs affected the participants’ memories of the accident, showing that memory can be easily distorted.

This research suggests that memory can be easily manipulated by questioning technique. This means that information gathered after the event can merge with original memory causing incorrect recall or reconstructive memory. The addition of false details to a memory of an event is now referred to as confabulation. This concept has very important implications for the questions used in police interviews of eyewitnesses.

5. Cognitive Dissonance Experiment

Study conducted by: leon festinger and james carlsmith.

Study Conducted in 1957 at Stanford University

Experiment Details: The concept of cognitive dissonance refers to a situation involving conflicting:

This conflict produces an inherent feeling of discomfort leading to a change in one of the attitudes, beliefs or behaviors to minimize or eliminate the discomfort and restore balance.

Cognitive dissonance was first investigated by Leon Festinger, after an observational study of a cult that believed that the earth was going to be destroyed by a flood. Out of this study was born an intriguing experiment conducted by Festinger and Carlsmith where participants were asked to perform a series of dull tasks (such as turning pegs in a peg board for an hour). Participant’s initial attitudes toward this task were highly negative.

They were then paid either $1 or $20 to tell a participant waiting in the lobby that the tasks were really interesting. Almost all of the participants agreed to walk into the waiting room and persuade the next participant that the boring experiment would be fun. When the participants were later asked to evaluate the experiment, the participants who were paid only $1 rated the tedious task as more fun and enjoyable than the participants who were paid $20 to lie.

Being paid only $1 is not sufficient incentive for lying and so those who were paid $1 experienced dissonance. They could only overcome that cognitive dissonance by coming to believe that the tasks really were interesting and enjoyable. Being paid $20 provides a reason for turning pegs and there is therefore no dissonance.

6. Fantz’s Looking Chamber

Study conducted by: robert l. fantz.

Study Conducted in 1961 at the University of Illinois

Experiment Details: The study conducted by Robert L. Fantz is among the simplest, yet most important in the field of infant development and vision. In 1961, when this experiment was conducted, there very few ways to study what was going on in the mind of an infant. Fantz realized that the best way was to simply watch the actions and reactions of infants. He understood the fundamental factor that if there is something of interest near humans, they generally look at it.

To test this concept, Fantz set up a display board with two pictures attached. On one was a bulls-eye. On the other was the sketch of a human face. This board was hung in a chamber where a baby could lie safely underneath and see both images. Then, from behind the board, invisible to the baby, he peeked through a hole to watch what the baby looked at. This study showed that a two-month old baby looked twice as much at the human face as it did at the bulls-eye. This suggests that human babies have some powers of pattern and form selection. Before this experiment it was thought that babies looked out onto a chaotic world of which they could make little sense.

7. Hawthorne Effect

Study conducted by: henry a. landsberger.

Study Conducted in 1955 at Hawthorne Works in Chicago, Illinois

Landsberger performed the study by analyzing data from experiments conducted between 1924 and 1932, by Elton Mayo, at the Hawthorne Works near Chicago. The company had commissioned studies to evaluate whether the level of light in a building changed the productivity of the workers. What Mayo found was that the level of light made no difference in productivity. The workers increased their output whenever the amount of light was switched from a low level to a high level, or vice versa.

The researchers noticed a tendency that the workers’ level of efficiency increased when any variable was manipulated. The study showed that the output changed simply because the workers were aware that they were under observation. The conclusion was that the workers felt important because they were pleased to be singled out. They increased productivity as a result. Being singled out was the factor dictating increased productivity, not the changing lighting levels, or any of the other factors that they experimented upon.

The Hawthorne Effect has become one of the hardest inbuilt biases to eliminate or factor into the design of any experiment in psychology and beyond.

8. Kitty Genovese Case

Study conducted by: new york police force.

Study Conducted in 1964 in New York City

Experiment Details: The murder case of Kitty Genovese was never intended to be a psychological experiment, however it ended up having serious implications for the field.

According to a New York Times article, almost 40 neighbors witnessed Kitty Genovese being savagely attacked and murdered in Queens, New York in 1964. Not one neighbor called the police for help. Some reports state that the attacker briefly left the scene and later returned to “finish off” his victim. It was later uncovered that many of these facts were exaggerated. (There were more likely only a dozen witnesses and records show that some calls to police were made).

What this case later become famous for is the “Bystander Effect,” which states that the more bystanders that are present in a social situation, the less likely it is that anyone will step in and help. This effect has led to changes in medicine, psychology and many other areas. One famous example is the way CPR is taught to new learners. All students in CPR courses learn that they must assign one bystander the job of alerting authorities which minimizes the chances of no one calling for assistance.

9. Learned Helplessness Experiment

Study conducted by: martin seligman.

Study Conducted in 1967 at the University of Pennsylvania

Seligman’s experiment involved the ringing of a bell and then the administration of a light shock to a dog. After a number of pairings, the dog reacted to the shock even before it happened. As soon as the dog heard the bell, he reacted as though he’d already been shocked.

During the course of this study something unexpected happened. Each dog was placed in a large crate that was divided down the middle with a low fence. The dog could see and jump over the fence easily. The floor on one side of the fence was electrified, but not on the other side of the fence. Seligman placed each dog on the electrified side and administered a light shock. He expected the dog to jump to the non-shocking side of the fence. In an unexpected turn, the dogs simply laid down.

The hypothesis was that as the dogs learned from the first part of the experiment that there was nothing they could do to avoid the shocks, they gave up in the second part of the experiment. To prove this hypothesis the experimenters brought in a new set of animals and found that dogs with no history in the experiment would jump over the fence.

This condition was described as learned helplessness. A human or animal does not attempt to get out of a negative situation because the past has taught them that they are helpless.

10. Little Albert Experiment

Study conducted by: john b. watson and rosalie rayner.

Study Conducted in 1920 at Johns Hopkins University

The experiment began by placing a white rat in front of the infant, who initially had no fear of the animal. Watson then produced a loud sound by striking a steel bar with a hammer every time little Albert was presented with the rat. After several pairings (the noise and the presentation of the white rat), the boy began to cry and exhibit signs of fear every time the rat appeared in the room. Watson also created similar conditioned reflexes with other common animals and objects (rabbits, Santa beard, etc.) until Albert feared them all.

This study proved that classical conditioning works on humans. One of its most important implications is that adult fears are often connected to early childhood experiences.

11. Magical Number Seven

Study conducted by: george a. miller.

Study Conducted in 1956 at Princeton University

Experiment Details:   Frequently referred to as “ Miller’s Law,” the Magical Number Seven experiment purports that the number of objects an average human can hold in working memory is 7 ± 2. This means that the human memory capacity typically includes strings of words or concepts ranging from 5-9. This information on the limits to the capacity for processing information became one of the most highly cited papers in psychology.

The Magical Number Seven Experiment was published in 1956 by cognitive psychologist George A. Miller of Princeton University’s Department of Psychology in Psychological Review .  In the article, Miller discussed a concurrence between the limits of one-dimensional absolute judgment and the limits of short-term memory.

In a one-dimensional absolute-judgment task, a person is presented with a number of stimuli that vary on one dimension (such as 10 different tones varying only in pitch). The person responds to each stimulus with a corresponding response (learned before).

Performance is almost perfect up to five or six different stimuli but declines as the number of different stimuli is increased. This means that a human’s maximum performance on one-dimensional absolute judgment can be described as an information store with the maximum capacity of approximately 2 to 3 bits of information There is the ability to distinguish between four and eight alternatives.

12. Pavlov’s Dog Experiment

Study conducted by: ivan pavlov.

Study Conducted in the 1890s at the Military Medical Academy in St. Petersburg, Russia

Pavlov began with the simple idea that there are some things that a dog does not need to learn. He observed that dogs do not learn to salivate when they see food. This reflex is “hard wired” into the dog. This is an unconditioned response (a stimulus-response connection that required no learning).

Pavlov outlined that there are unconditioned responses in the animal by presenting a dog with a bowl of food and then measuring its salivary secretions. In the experiment, Pavlov used a bell as his neutral stimulus. Whenever he gave food to his dogs, he also rang a bell. After a number of repeats of this procedure, he tried the bell on its own. What he found was that the bell on its own now caused an increase in salivation. The dog had learned to associate the bell and the food. This learning created a new behavior. The dog salivated when he heard the bell. Because this response was learned (or conditioned), it is called a conditioned response. The neutral stimulus has become a conditioned stimulus.

This theory came to be known as classical conditioning.

13. Robbers Cave Experiment

Study conducted by: muzafer and carolyn sherif.

Study Conducted in 1954 at the University of Oklahoma

Experiment Details: This experiment, which studied group conflict, is considered by most to be outside the lines of what is considered ethically sound.

In 1954 researchers at the University of Oklahoma assigned 22 eleven- and twelve-year-old boys from similar backgrounds into two groups. The two groups were taken to separate areas of a summer camp facility where they were able to bond as social units. The groups were housed in separate cabins and neither group knew of the other’s existence for an entire week. The boys bonded with their cabin mates during that time. Once the two groups were allowed to have contact, they showed definite signs of prejudice and hostility toward each other even though they had only been given a very short time to develop their social group. To increase the conflict between the groups, the experimenters had them compete against each other in a series of activities. This created even more hostility and eventually the groups refused to eat in the same room. The final phase of the experiment involved turning the rival groups into friends. The fun activities the experimenters had planned like shooting firecrackers and watching movies did not initially work, so they created teamwork exercises where the two groups were forced to collaborate. At the end of the experiment, the boys decided to ride the same bus home, demonstrating that conflict can be resolved and prejudice overcome through cooperation.

Many critics have compared this study to Golding’s Lord of the Flies novel as a classic example of prejudice and conflict resolution.

14. Ross’ False Consensus Effect Study

Study conducted by: lee ross.

Study Conducted in 1977 at Stanford University

Experiment Details: In 1977, a social psychology professor at Stanford University named Lee Ross conducted an experiment that, in lay terms, focuses on how people can incorrectly conclude that others think the same way they do, or form a “false consensus” about the beliefs and preferences of others. Ross conducted the study in order to outline how the “false consensus effect” functions in humans.

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In the first part of the study, participants were asked to read about situations in which a conflict occurred and then were told two alternative ways of responding to the situation. They were asked to do three things:

• Guess which option other people would choose
• Say which option they themselves would choose
• Describe the attributes of the person who would likely choose each of the two options

What the study showed was that most of the subjects believed that other people would do the same as them, regardless of which of the two responses they actually chose themselves. This phenomenon is referred to as the false consensus effect, where an individual thinks that other people think the same way they do when they may not. The second observation coming from this important study is that when participants were asked to describe the attributes of the people who will likely make the choice opposite of their own, they made bold and sometimes negative predictions about the personalities of those who did not share their choice.

15. The Schacter and Singer Experiment on Emotion

Study conducted by: stanley schachter and jerome e. singer.

Study Conducted in 1962 at Columbia University

Experiment Details: In 1962 Schachter and Singer conducted a ground breaking experiment to prove their theory of emotion.

In the study, a group of 184 male participants were injected with epinephrine, a hormone that induces arousal including increased heartbeat, trembling, and rapid breathing. The research participants were told that they were being injected with a new medication to test their eyesight. The first group of participants was informed the possible side effects that the injection might cause while the second group of participants were not. The participants were then placed in a room with someone they thought was another participant, but was actually a confederate in the experiment. The confederate acted in one of two ways: euphoric or angry. Participants who had not been informed about the effects of the injection were more likely to feel either happier or angrier than those who had been informed.

What Schachter and Singer were trying to understand was the ways in which cognition or thoughts influence human emotion. Their study illustrates the importance of how people interpret their physiological states, which form an important component of your emotions. Though their cognitive theory of emotional arousal dominated the field for two decades, it has been criticized for two main reasons: the size of the effect seen in the experiment was not that significant and other researchers had difficulties repeating the experiment.

16. Selective Attention / Invisible Gorilla Experiment

Study conducted by: daniel simons and christopher chabris.

Study Conducted in 1999 at Harvard University

Experiment Details: In 1999 Simons and Chabris conducted their famous awareness test at Harvard University.

Participants in the study were asked to watch a video and count how many passes occurred between basketball players on the white team. The video moves at a moderate pace and keeping track of the passes is a relatively easy task. What most people fail to notice amidst their counting is that in the middle of the test, a man in a gorilla suit walked onto the court and stood in the center before walking off-screen.

The study found that the majority of the subjects did not notice the gorilla at all, proving that humans often overestimate their ability to effectively multi-task. What the study set out to prove is that when people are asked to attend to one task, they focus so strongly on that element that they may miss other important details.

17. Stanford Prison Study

Study conducted by philip zimbardo.

Study Conducted in 1971 at Stanford University

The Stanford Prison Experiment was designed to study behavior of “normal” individuals when assigned a role of prisoner or guard. College students were recruited to participate. They were assigned roles of “guard” or “inmate.”  Zimbardo played the role of the warden. The basement of the psychology building was the set of the prison. Great care was taken to make it look and feel as realistic as possible.

The prison guards were told to run a prison for two weeks. They were told not to physically harm any of the inmates during the study. After a few days, the prison guards became very abusive verbally towards the inmates. Many of the prisoners became submissive to those in authority roles. The Stanford Prison Experiment inevitably had to be cancelled because some of the participants displayed troubling signs of breaking down mentally.

Although the experiment was conducted very unethically, many psychologists believe that the findings showed how much human behavior is situational. People will conform to certain roles if the conditions are right. The Stanford Prison Experiment remains one of the most famous psychology experiments of all time.

18. Stanley Milgram Experiment

Study conducted by stanley milgram.

Study Conducted in 1961 at Stanford University

Experiment Details: This 1961 study was conducted by Yale University psychologist Stanley Milgram. It was designed to measure people’s willingness to obey authority figures when instructed to perform acts that conflicted with their morals. The study was based on the premise that humans will inherently take direction from authority figures from very early in life.

Participants were told they were participating in a study on memory. They were asked to watch another person (an actor) do a memory test. They were instructed to press a button that gave an electric shock each time the person got a wrong answer. (The actor did not actually receive the shocks, but pretended they did).

Participants were told to play the role of “teacher” and administer electric shocks to “the learner,” every time they answered a question incorrectly. The experimenters asked the participants to keep increasing the shocks. Most of them obeyed even though the individual completing the memory test appeared to be in great pain. Despite these protests, many participants continued the experiment when the authority figure urged them to. They increased the voltage after each wrong answer until some eventually administered what would be lethal electric shocks.

This experiment showed that humans are conditioned to obey authority and will usually do so even if it goes against their natural morals or common sense.

19. Surrogate Mother Experiment

Study conducted by: harry harlow.

Study Conducted from 1957-1963 at the University of Wisconsin

Experiment Details: In a series of controversial experiments during the late 1950s and early 1960s, Harry Harlow studied the importance of a mother’s love for healthy childhood development.

In order to do this he separated infant rhesus monkeys from their mothers a few hours after birth and left them to be raised by two “surrogate mothers.” One of the surrogates was made of wire with an attached bottle for food. The other was made of soft terrycloth but lacked food. The researcher found that the baby monkeys spent much more time with the cloth mother than the wire mother, thereby proving that affection plays a greater role than sustenance when it comes to childhood development. They also found that the monkeys that spent more time cuddling the soft mother grew up to healthier.

This experiment showed that love, as demonstrated by physical body contact, is a more important aspect of the parent-child bond than the provision of basic needs. These findings also had implications in the attachment between fathers and their infants when the mother is the source of nourishment.

20. The Good Samaritan Experiment

Study conducted by: john darley and daniel batson.

Study Conducted in 1973 at The Princeton Theological Seminary (Researchers were from Princeton University)

Experiment Details: In 1973, an experiment was created by John Darley and Daniel Batson, to investigate the potential causes that underlie altruistic behavior. The researchers set out three hypotheses they wanted to test:

• People thinking about religion and higher principles would be no more inclined to show helping behavior than laymen.
• People in a rush would be much less likely to show helping behavior.
• People who are religious for personal gain would be less likely to help than people who are religious because they want to gain some spiritual and personal insights into the meaning of life.

Student participants were given some religious teaching and instruction. They were then were told to travel from one building to the next. Between the two buildings was a man lying injured and appearing to be in dire need of assistance. The first variable being tested was the degree of urgency impressed upon the subjects, with some being told not to rush and others being informed that speed was of the essence.

The results of the experiment were intriguing, with the haste of the subject proving to be the overriding factor. When the subject was in no hurry, nearly two-thirds of people stopped to lend assistance. When the subject was in a rush, this dropped to one in ten.

People who were on the way to deliver a speech about helping others were nearly twice as likely to help as those delivering other sermons,. This showed that the thoughts of the individual were a factor in determining helping behavior. Religious beliefs did not appear to make much difference on the results. Being religious for personal gain, or as part of a spiritual quest, did not appear to make much of an impact on the amount of helping behavior shown.

21. The Halo Effect Experiment

Study conducted by: richard e. nisbett and timothy decamp wilson.

Study Conducted in 1977 at the University of Michigan

Experiment Details: The Halo Effect states that people generally assume that people who are physically attractive are more likely to:

• be intelligent
• be friendly
• display good judgment

To prove their theory, Nisbett and DeCamp Wilson created a study to prove that people have little awareness of the nature of the Halo Effect. They’re not aware that it influences:

• their personal judgments
• the production of a more complex social behavior

In the experiment, college students were the research participants. They were asked to evaluate a psychology instructor as they view him in a videotaped interview. The students were randomly assigned to one of two groups. Each group was shown one of two different interviews with the same instructor. The instructor is a native French-speaking Belgian who spoke English with a noticeable accent. In the first video, the instructor presented himself as someone:

• respectful of his students’ intelligence and motives
• flexible in his approach to teaching
• enthusiastic about his subject matter

In the second interview, he presented himself as much more unlikable. He was cold and distrustful toward the students and was quite rigid in his teaching style.

After watching the videos, the subjects were asked to rate the lecturer on:

• physical appearance

His mannerisms and accent were kept the same in both versions of videos. The subjects were asked to rate the professor on an 8-point scale ranging from “like extremely” to “dislike extremely.” Subjects were also told that the researchers were interested in knowing “how much their liking for the teacher influenced the ratings they just made.” Other subjects were asked to identify how much the characteristics they just rated influenced their liking of the teacher.

After responding to the questionnaire, the respondents were puzzled about their reactions to the videotapes and to the questionnaire items. The students had no idea why they gave one lecturer higher ratings. Most said that how much they liked the lecturer had not affected their evaluation of his individual characteristics at all.

The interesting thing about this study is that people can understand the phenomenon, but they are unaware when it is occurring. Without realizing it, humans make judgments. Even when it is pointed out, they may still deny that it is a product of the halo effect phenomenon.

22. The Marshmallow Test

Study conducted by: walter mischel.

Study Conducted in 1972 at Stanford University

In his 1972 Marshmallow Experiment, children ages four to six were taken into a room where a marshmallow was placed in front of them on a table. Before leaving each of the children alone in the room, the experimenter informed them that they would receive a second marshmallow if the first one was still on the table after they returned in 15 minutes. The examiner recorded how long each child resisted eating the marshmallow and noted whether it correlated with the child’s success in adulthood. A small number of the 600 children ate the marshmallow immediately and one-third delayed gratification long enough to receive the second marshmallow.

In follow-up studies, Mischel found that those who deferred gratification were significantly more competent and received higher SAT scores than their peers. This characteristic likely remains with a person for life. While this study seems simplistic, the findings outline some of the foundational differences in individual traits that can predict success.

23. The Monster Study

Study conducted by: wendell johnson.

Study Conducted in 1939 at the University of Iowa

Experiment Details: The Monster Study received this negative title due to the unethical methods that were used to determine the effects of positive and negative speech therapy on children.

Wendell Johnson of the University of Iowa selected 22 orphaned children, some with stutters and some without. The children were in two groups. The group of children with stutters was placed in positive speech therapy, where they were praised for their fluency. The non-stutterers were placed in negative speech therapy, where they were disparaged for every mistake in grammar that they made.

As a result of the experiment, some of the children who received negative speech therapy suffered psychological effects and retained speech problems for the rest of their lives. They were examples of the significance of positive reinforcement in education.

The initial goal of the study was to investigate positive and negative speech therapy. However, the implication spanned much further into methods of teaching for young children.

24. Violinist at the Metro Experiment

Study conducted by: staff at the washington post.

Study Conducted in 2007 at a Washington D.C. Metro Train Station

During the study, pedestrians rushed by without realizing that the musician playing at the entrance to the metro stop was Grammy-winning musician, Joshua Bell. Two days before playing in the subway, he sold out at a theater in Boston where the seats average $100. He played one of the most intricate pieces ever written with a violin worth 3.5 million dollars. In the 45 minutes the musician played his violin, only 6 people stopped and stayed for a while. Around 20 gave him money, but continued to walk their normal pace. He collected $32.

The study and the subsequent article organized by the Washington Post was part of a social experiment looking at:

• the priorities of people

Gene Weingarten wrote about the social experiment: “In a banal setting at an inconvenient time, would beauty transcend?” Later he won a Pulitzer Prize for his story. Some of the questions the article addresses are:

• Do we perceive beauty?
• Do we stop to appreciate it?
• Do we recognize the talent in an unexpected context?

As it turns out, many of us are not nearly as perceptive to our environment as we might like to think.

25. Visual Cliff Experiment

Study conducted by: eleanor gibson and richard walk.

Study Conducted in 1959 at Cornell University

Experiment Details: In 1959, psychologists Eleanor Gibson and Richard Walk set out to study depth perception in infants. They wanted to know if depth perception is a learned behavior or if it is something that we are born with. To study this, Gibson and Walk conducted the visual cliff experiment.

They studied 36 infants between the ages of six and 14 months, all of whom could crawl. The infants were placed one at a time on a visual cliff. A visual cliff was created using a large glass table that was raised about a foot off the floor. Half of the glass table had a checker pattern underneath in order to create the appearance of a ‘shallow side.’

In order to create a ‘deep side,’ a checker pattern was created on the floor; this side is the visual cliff. The placement of the checker pattern on the floor creates the illusion of a sudden drop-off. Researchers placed a foot-wide centerboard between the shallow side and the deep side. Gibson and Walk found the following:

• Nine of the infants did not move off the centerboard.
• All of the 27 infants who did move crossed into the shallow side when their mothers called them from the shallow side.
• Three of the infants crawled off the visual cliff toward their mother when called from the deep side.
• When called from the deep side, the remaining 24 children either crawled to the shallow side or cried because they could not cross the visual cliff and make it to their mother.

What this study helped demonstrate is that depth perception is likely an inborn train in humans.

Among these experiments and psychological tests, we see boundaries pushed and theories taking on a life of their own. It is through the endless stream of psychological experimentation that we can see simple hypotheses become guiding theories for those in this field. The greater field of psychology became a formal field of experimental study in 1879, when Wilhelm Wundt established the first laboratory dedicated solely to psychological research in Leipzig, Germany. Wundt was the first person to refer to himself as a psychologist. Since 1879, psychology has grown into a massive collection of:

• methods of practice

It’s also a specialty area in the field of healthcare. None of this would have been possible without these and many other important psychological experiments that have stood the test of time.

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About the Author

After earning a Bachelor of Arts in Psychology from Rutgers University and then a Master of Science in Clinical and Forensic Psychology from Drexel University, Kristen began a career as a therapist at two prisons in Philadelphia. At the same time she volunteered as a rape crisis counselor, also in Philadelphia. After a few years in the field she accepted a teaching position at a local college where she currently teaches online psychology courses. Kristen began writing in college and still enjoys her work as a writer, editor, professor and mother.

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10 of the Most Surprising Findings in Psychology

How behavioral science regularly teaches us something new..

Posted June 14, 2021 | Reviewed by Davia Sills

• Psychology is regularly accused of being a "soft science," full of intuitive information.
• In fact, the behavioral sciences use rigorous methodological and statistical procedures, producing useful and novel findings.
• Here are 10 findings (of thousands) from the behavioral sciences that shed important and novel light on the human experience.

The behavioral sciences (which I see as a subset of psychology proper) are sometimes accused of being "soft" and of being full of intuitive findings. Honestly, if this all were true, I would have had a hard time dedicating the last three decades of my career to this field!

In fact, behavioral scientists are trained intensively in rigorous methodological and statistical procedures. I took seven statistics courses across my own undergraduate and graduate career as an example.

One measure of how useful our field is pertains to the ability to turn up novel findings about human behavior that are not simply intuitive. OK, I'll admit that sometimes in our field, we do publish something that everyone already knows (such as research showing that kids don't like bitter vegetables). That said, when you start to look for non-intuitive findings in the field, you end up seeing many of them. And these findings provide important insight into the broader human experience.

Below are 10 such findings that will, hopefully, encourage the reader to step back and see the importance of behavioral science in a bigger frame.

1. Under some conditions, paying people for their work makes them work less hard.

Classic work on the topic of cognitive dissonance has found that under many conditions, if you pay someone to do some task, they realize that they are only doing it for the money, and their motivation regarding the task itself reduces dramatically (see Festinger & Carlsmith, 1959).

2. Many people are capable of killing someone who is totally innocent if an authority figure requests them to do so.

In his classic research on obedience to authority, Stanley Milgram found that a substantial portion of regular Americans are capable of engaging in behavior that would kill an innocent man simply because an authority figure requested that they do so (Milgram, 1963).

3. Reactions to infidelity account for about one-third of homicides in the modern world.

An analysis of thousands of homicides from two large North American cities found that a full one-third of homicides are connected, in a significant way, with infidelity (Daly & Wilson, 1982).

4. Basic facial expressions of emotions cut across all cultures of the globe.

The way that people express and understand emotional facial expressions varies almost zero percent across all human groups that have ever been studied (Ekman & Friesen, 1986).

5. We tend to see people who are in "other" groups as all the same as one another relative to people in our own groups.

When we think of people as being members of some "other" group from our own, we literally are unable to see variability among them; we literally tend to see them as "all the same" (Haslam et al., 1996). This phenomenon is known as outgroup homogeneity .

6. Our psychological connections with dogs and cats have strong roots in the human evolutionary story.

Next time you look at your dog or your cat, realize that our psychological connections with these creatures actually go far back into human evolutionary history. They joined us in this journey for very specific, evolution-based reasons.

7. The same five basic personality traits characterize people across the globe.

Research into basic personality traits, which shows much variability from person to person, has found that the same basic personality traits— extraversion , emotional stability , open-mindedness, agreeableness , and conscientiousness —characterize how people differ from one another in all corners of the Earth (see Schmitt et al., 2007).

8. Situational factors account for more "evil" behavior than dispositional factors.

A mountain of research on "evil" or anti-social behavior points to this conclusion: Evil behavior is much more the result of situational factors than dispositional factors. Thus, it is more accurate to talk about environmental conditions that facilitate evil behavior than it is to talk about "bad people" (see Zimbardo, 2007).

9. Anxiety actually has an important role in human functioning.

While on the surface, we tend to think of anxiety as simply problematic and as something that we need to reduce, in fact, anxiety acts very much like a Darwinian adaptation, leading to benefits such as success at all kinds of tasks. A moderate degree of anxiety is, in fact, a good thing (see Nesse & Williams, 1994).

10. There really is something to the idea of true love. And we can see it in people's brains.

True love really is a thing, and it can be observed in neural activity in the brain. Helen Fisher has dedicated a lifetime of intensive research that ultimately points toward this conclusion (see Fisher, 2012).

Bottom Line

Across the past several decades, work in the behavioral sciences has shed light on a broad array of topics that underlie the human experience. Work in this field is not subjective, fluffy, or intuitive. It is, in fact, rigorous science that utilizes the most advanced statistical processes available in an effort to help us better understand who we are.

The 10 not-necessarily-intuitive findings summarized here are, in fact, the tip of the iceberg. Welcome to scientific psychology.

Facebook /LinkedIn image: Mix Tape/Shutterstock

Daly, M., & Wilson, M. I. (1982). Homicide and Kinship. American Anthropologist, 84, 372-78.

Ekman, P., & Friesen, W. V. (1986). A new pan-cultural facial expression of emotion. Motivation and Emotion, 10, 159-168.

Festinger, L., & Carlsmith, K. (1959). Cognitive consequences of forced compliance. Journal of Abnormal and Social Psychology, 58, 203-210.

Fisher, HE (2012). In Geoff Warburton, Ed. WE HAVE CHEMISTRY! The Role of Four Primary Temperament Dimensions in Mate Choice and Partner Compatibility. The Psychotherapist, Autumn 2012:Issue 52: 8-9. United Kingdom.

Haslam, A., Oakes, P., Turner, J., & McGarty, C. (1996). Social identity, self-categorization, and the perceived homogeneity of ingroups and outgroups: The interaction between social motivation and cognition. In R. Sorrentino & E. Higgins (Eds.). Handbook of Motivation and Cognition: Foundations of Social Behavior. New York: Guilford Press. pp. 182–222. (Chapter 4)

Milgram, S. (1963). Behavioral Study of Obedience. Journal of Abnormal and Social Psychology, 67, 371–8.

Nesse RM, Williams GC: Why We Get Sick: The New Science of Darwinian Medicine, Times Books, New York, 1994.

Schmitt, DP., Allik, J., McCrae, RR., Benet-Martínez, V., Alcalay, L., Ault, L., et al. (2007) 'The geographic distribution of Big Five personality traits: Patterns and profiles of human self-description across 56 nations'. Journal of Cross-Cultural Psychology, 38 (2). pp. 173 - 212. ISSN: 0022-0221

Zimbardo, P. (2007). The Lucifer Effect: Understanding How Good People Turn Evil". The Journal of The American Medical Association. 298 (11): 1338–1340.

Glenn Geher, Ph.D. , is professor of psychology at the State University of New York at New Paltz. He is founding director of the campus’ Evolutionary Studies (EvoS) program.

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15 Famous Experiments and Case Studies in Psychology

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Dr. Chris Drew is the founder of the Helpful Professor. He holds a PhD in education and has published over 20 articles in scholarly journals. He is the former editor of the Journal of Learning Development in Higher Education. [Image Descriptor: Photo of Chris]

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Psychology has seen thousands upon thousands of research studies over the years. Most of these studies have helped shape our current understanding of human thoughts, behavior, and feelings.

The psychology case studies in this list are considered classic examples of psychological case studies and experiments, which are still being taught in introductory psychology courses up to this day.

Some studies, however, were downright shocking and controversial that you’d probably wonder why such studies were conducted back in the day. Imagine participating in an experiment for a small reward or extra class credit, only to be left scarred for life. These kinds of studies, however, paved the way for a more ethical approach to studying psychology and implementation of research standards such as the use of debriefing in psychology research .

Case Study vs. Experiment

Before we dive into the list of the most famous studies in psychology, let us first review the difference between case studies and experiments.

• It is an in-depth study and analysis of an individual, group, community, or phenomenon. The results of a case study cannot be applied to the whole population, but they can provide insights for further studies.
• It often uses qualitative research methods such as observations, surveys, and interviews.
• It is often conducted in real-life settings rather than in controlled environments.
• An experiment is a type of study done on a sample or group of random participants, the results of which can be generalized to the whole population.
• It often uses quantitative research methods that rely on numbers and statistics.
• It is conducted in controlled environments, wherein some things or situations are manipulated.

See Also: Experimental vs Observational Studies

Famous Experiments in Psychology

1. the marshmallow experiment.

Psychologist Walter Mischel conducted the marshmallow experiment at Stanford University in the 1960s to early 1970s. It was a simple test that aimed to define the connection between delayed gratification and success in life.

The instructions were fairly straightforward: children ages 4-6 were presented a piece of marshmallow on a table and they were told that they would receive a second piece if they could wait for 15 minutes without eating the first marshmallow.

About one-third of the 600 participants succeeded in delaying gratification to receive the second marshmallow. Mischel and his team followed up on these participants in the 1990s, learning that those who had the willpower to wait for a larger reward experienced more success in life in terms of SAT scores and other metrics.

This case study also supported self-control theory , a theory in criminology that holds that people with greater self-control are less likely to end up in trouble with the law!

The classic marshmallow experiment, however, was debunked in a 2018 replication study done by Tyler Watts and colleagues.

This more recent experiment had a larger group of participants (900) and a better representation of the general population when it comes to race and ethnicity. In this study, the researchers found out that the ability to wait for a second marshmallow does not depend on willpower alone but more so on the economic background and social status of the participants.

2. The Bystander Effect

In 1694, Kitty Genovese was murdered in the neighborhood of Kew Gardens, New York. It was told that there were up to 38 witnesses and onlookers in the vicinity of the crime scene, but nobody did anything to stop the murder or call for help.

Such tragedy was the catalyst that inspired social psychologists Bibb Latane and John Darley to formulate the phenomenon called bystander effect or bystander apathy .

Subsequent investigations showed that this story was exaggerated and inaccurate, as there were actually only about a dozen witnesses, at least two of whom called the police. But the case of Kitty Genovese led to various studies that aim to shed light on the bystander phenomenon.

Latane and Darley tested bystander intervention in an experimental study . Participants were asked to answer a questionnaire inside a room, and they would either be alone or with two other participants (who were actually actors or confederates in the study). Smoke would then come out from under the door. The reaction time of participants was tested — how long would it take them to report the smoke to the authorities or the experimenters?

The results showed that participants who were alone in the room reported the smoke faster than participants who were with two passive others. The study suggests that the more onlookers are present in an emergency situation, the less likely someone would step up to help, a social phenomenon now popularly called the bystander effect.

3. Asch Conformity Study

Have you ever made a decision against your better judgment just to fit in with your friends or family? The Asch Conformity Studies will help you understand this kind of situation better.

In this experiment, a group of participants were shown three numbered lines of different lengths and asked to identify the longest of them all. However, only one true participant was present in every group and the rest were actors, most of whom told the wrong answer.

Results showed that the participants went for the wrong answer, even though they knew which line was the longest one in the first place. When the participants were asked why they identified the wrong one, they said that they didn’t want to be branded as strange or peculiar.

This study goes to show that there are situations in life when people prefer fitting in than being right. It also tells that there is power in numbers — a group’s decision can overwhelm a person and make them doubt their judgment.

4. The Bobo Doll Experiment

The Bobo Doll Experiment was conducted by Dr. Albert Bandura, the proponent of social learning theory .

Back in the 1960s, the Nature vs. Nurture debate was a popular topic among psychologists. Bandura contributed to this discussion by proposing that human behavior is mostly influenced by environmental rather than genetic factors.

In the Bobo Doll Experiment, children were divided into three groups: one group was shown a video in which an adult acted aggressively toward the Bobo Doll, the second group was shown a video in which an adult play with the Bobo Doll, and the third group served as the control group where no video was shown.

The children were then led to a room with different kinds of toys, including the Bobo Doll they’ve seen in the video. Results showed that children tend to imitate the adults in the video. Those who were presented the aggressive model acted aggressively toward the Bobo Doll while those who were presented the passive model showed less aggression.

While the Bobo Doll Experiment can no longer be replicated because of ethical concerns, it has laid out the foundations of social learning theory and helped us understand the degree of influence adult behavior has on children.

5. Blue Eye / Brown Eye Experiment

Following the assassination of Martin Luther King Jr. in 1968, third-grade teacher Jane Elliott conducted an experiment in her class. Although not a formal experiment in controlled settings, A Class Divided is a good example of a social experiment to help children understand the concept of racism and discrimination.

The class was divided into two groups: blue-eyed children and brown-eyed children. For one day, Elliott gave preferential treatment to her blue-eyed students, giving them more attention and pampering them with rewards. The next day, it was the brown-eyed students’ turn to receive extra favors and privileges.

As a result, whichever group of students was given preferential treatment performed exceptionally well in class, had higher quiz scores, and recited more frequently; students who were discriminated against felt humiliated, answered poorly in tests, and became uncertain with their answers in class.

This study is now widely taught in sociocultural psychology classes.

6. Stanford Prison Experiment

One of the most controversial and widely-cited studies in psychology is the Stanford Prison Experiment , conducted by Philip Zimbardo at the basement of the Stanford psychology building in 1971. The hypothesis was that abusive behavior in prisons is influenced by the personality traits of the prisoners and prison guards.

The participants in the experiment were college students who were randomly assigned as either a prisoner or a prison guard. The prison guards were then told to run the simulated prison for two weeks. However, the experiment had to be stopped in just 6 days.

The prison guards abused their authority and harassed the prisoners through verbal and physical means. The prisoners, on the other hand, showed submissive behavior. Zimbardo decided to stop the experiment because the prisoners were showing signs of emotional and physical breakdown.

Although the experiment wasn’t completed, the results strongly showed that people can easily get into a social role when others expect them to, especially when it’s highly stereotyped .

7. The Halo Effect

Have you ever wondered why toothpastes and other dental products are endorsed in advertisements by celebrities more often than dentists? The Halo Effect is one of the reasons!

The Halo Effect shows how one favorable attribute of a person can gain them positive perceptions in other attributes. In the case of product advertisements, attractive celebrities are also perceived as intelligent and knowledgeable of a certain subject matter even though they’re not technically experts.

The Halo Effect originated in a classic study done by Edward Thorndike in the early 1900s. He asked military commanding officers to rate their subordinates based on different qualities, such as physical appearance, leadership, dependability, and intelligence.

The results showed that high ratings of a particular quality influences the ratings of other qualities, producing a halo effect of overall high ratings. The opposite also applied, which means that a negative rating in one quality also correlated to negative ratings in other qualities.

Experiments on the Halo Effect came in various formats as well, supporting Thorndike’s original theory. This phenomenon suggests that our perception of other people’s overall personality is hugely influenced by a quality that we focus on.

8. Cognitive Dissonance

There are experiences in our lives when our beliefs and behaviors do not align with each other and we try to justify them in our minds. This is cognitive dissonance , which was studied in an experiment by Leon Festinger and James Carlsmith back in 1959.

In this experiment, participants had to go through a series of boring and repetitive tasks, such as spending an hour turning pegs in a wooden knob. After completing the tasks, they were then paid either $1 or $20 to tell the next participants that the tasks were extremely fun and enjoyable. Afterwards, participants were asked to rate the experiment. Those who were given $1 rated the experiment as more interesting and fun than those who received $20.

The results showed that those who received a smaller incentive to lie experienced cognitive dissonance — $1 wasn’t enough incentive for that one hour of painstakingly boring activity, so the participants had to justify that they had fun anyway.

Famous Case Studies in Psychology

9. little albert.

In 1920, behaviourist theorists John Watson and Rosalie Rayner experimented on a 9-month-old baby to test the effects of classical conditioning in instilling fear in humans.

This was such a controversial study that it gained popularity in psychology textbooks and syllabi because it is a classic example of unethical research studies done in the name of science.

In one of the experiments, Little Albert was presented with a harmless stimulus or object, a white rat, which he wasn’t scared of at first. But every time Little Albert would see the white rat, the researchers would play a scary sound of hammer and steel. After about 6 pairings, Little Albert learned to fear the rat even without the scary sound.

Little Albert developed signs of fear to different objects presented to him through classical conditioning . He even generalized his fear to other stimuli not present in the course of the experiment.

10. Phineas Gage

Phineas Gage is such a celebrity in Psych 101 classes, even though the way he rose to popularity began with a tragic accident. He was a resident of Central Vermont and worked in the construction of a new railway line in the mid-1800s. One day, an explosive went off prematurely, sending a tamping iron straight into his face and through his brain.

Gage survived the accident, fortunately, something that is considered a feat even up to this day. He managed to find a job as a stagecoach after the accident. However, his family and friends reported that his personality changed so much that “he was no longer Gage” (Harlow, 1868).

New evidence on the case of Phineas Gage has since come to light, thanks to modern scientific studies and medical tests. However, there are still plenty of mysteries revolving around his brain damage and subsequent recovery.

11. Anna O.

Anna O., a social worker and feminist of German Jewish descent, was one of the first patients to receive psychoanalytic treatment.

Her real name was Bertha Pappenheim and she inspired much of Sigmund Freud’s works and books on psychoanalytic theory, although they hadn’t met in person. Their connection was through Joseph Breuer, Freud’s mentor when he was still starting his clinical practice.

Anna O. suffered from paralysis, personality changes, hallucinations, and rambling speech, but her doctors could not find the cause. Joseph Breuer was then called to her house for intervention and he performed psychoanalysis, also called the “talking cure”, on her.

Breuer would tell Anna O. to say anything that came to her mind, such as her thoughts, feelings, and childhood experiences. It was noted that her symptoms subsided by talking things out.

However, Breuer later referred Anna O. to the Bellevue Sanatorium, where she recovered and set out to be a renowned writer and advocate of women and children.

12. Patient HM

H.M., or Henry Gustav Molaison, was a severe amnesiac who had been the subject of countless psychological and neurological studies.

Henry was 27 when he underwent brain surgery to cure the epilepsy that he had been experiencing since childhood. In an unfortunate turn of events, he lost his memory because of the surgery and his brain also became unable to store long-term memories.

He was then regarded as someone living solely in the present, forgetting an experience as soon as it happened and only remembering bits and pieces of his past. Over the years, his amnesia and the structure of his brain had helped neuropsychologists learn more about cognitive functions .

Suzanne Corkin, a researcher, writer, and good friend of H.M., recently published a book about his life. Entitled Permanent Present Tense , this book is both a memoir and a case study following the struggles and joys of Henry Gustav Molaison.

13. Chris Sizemore

Chris Sizemore gained celebrity status in the psychology community when she was diagnosed with multiple personality disorder, now known as dissociative identity disorder.

Sizemore has several alter egos, which included Eve Black, Eve White, and Jane. Various papers about her stated that these alter egos were formed as a coping mechanism against the traumatic experiences she underwent in her childhood.

Sizemore said that although she has succeeded in unifying her alter egos into one dominant personality, there were periods in the past experienced by only one of her alter egos. For example, her husband married her Eve White alter ego and not her.

Her story inspired her psychiatrists to write a book about her, entitled The Three Faces of Eve , which was then turned into a 1957 movie of the same title.

14. David Reimer

When David was just 8 months old, he lost his penis because of a botched circumcision operation.

Psychologist John Money then advised Reimer’s parents to raise him as a girl instead, naming him Brenda. His gender reassignment was supported by subsequent surgery and hormonal therapy.

Money described Reimer’s gender reassignment as a success, but problems started to arise as Reimer was growing up. His boyishness was not completely subdued by the hormonal therapy. When he was 14 years old, he learned about the secrets of his past and he underwent gender reassignment to become male again.

Reimer became an advocate for children undergoing the same difficult situation he had been. His life story ended when he was 38 as he took his own life.

15. Kim Peek

Kim Peek was the inspiration behind Rain Man , an Oscar-winning movie about an autistic savant character played by Dustin Hoffman.

The movie was released in 1988, a time when autism wasn’t widely known and acknowledged yet. So it was an eye-opener for many people who watched the film.

In reality, Kim Peek was a non-autistic savant. He was exceptionally intelligent despite the brain abnormalities he was born with. He was like a walking encyclopedia, knowledgeable about travel routes, US zip codes, historical facts, and classical music. He also read and memorized approximately 12,000 books in his lifetime.

This list of experiments and case studies in psychology is just the tip of the iceberg! There are still countless interesting psychology studies that you can explore if you want to learn more about human behavior and dynamics.

You can also conduct your own mini-experiment or participate in a study conducted in your school or neighborhood. Just remember that there are ethical standards to follow so as not to repeat the lasting physical and emotional harm done to Little Albert or the Stanford Prison Experiment participants.

Asch, S. E. (1956). Studies of independence and conformity: I. A minority of one against a unanimous majority. Psychological Monographs: General and Applied, 70 (9), 1–70. https://doi.org/10.1037/h0093718

Bandura, A., Ross, D., & Ross, S. A. (1961). Transmission of aggression through imitation of aggressive models. The Journal of Abnormal and Social Psychology, 63 (3), 575–582. https://doi.org/10.1037/h0045925

Elliott, J., Yale University., WGBH (Television station : Boston, Mass.), & PBS DVD (Firm). (2003). A class divided. New Haven, Conn.: Yale University Films.

Festinger, L., & Carlsmith, J. M. (1959). Cognitive consequences of forced compliance. The Journal of Abnormal and Social Psychology, 58 (2), 203–210. https://doi.org/10.1037/h0041593

Haney, C., Banks, W. C., & Zimbardo, P. G. (1973). A study of prisoners and guards in a simulated prison. Naval Research Review , 30 , 4-17.

Latane, B., & Darley, J. M. (1968). Group inhibition of bystander intervention in emergencies. Journal of Personality and Social Psychology, 10 (3), 215–221. https://doi.org/10.1037/h0026570

Mischel, W. (2014). The Marshmallow Test: Mastering self-control. Little, Brown and Co.

Thorndike, E. (1920) A Constant Error in Psychological Ratings. Journal of Applied Psychology , 4 , 25-29. http://dx.doi.org/10.1037/h0071663

Watson, J. B., & Rayner, R. (1920). Conditioned emotional reactions. Journal of experimental psychology , 3 (1), 1.

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The 11 Most Influential Psychological Experiments in History

The history of psychology is marked by groundbreaking experiments that transformed our understanding of the human mind. These 11 Most Influential Psychological Experiments in History stand out as pivotal, offering profound insights into behaviour, cognition, and the complexities of human nature.

In this PsychologyOrg article, we’ll explain these key experiments, exploring their impact on our understanding of human behaviour and the intricate workings of the mind.

Table of Contents

Experimental psychology.

Experimental psychology is a branch of psychology that uses scientific methods to study human behaviour and mental processes. Researchers in this field design experiments to test hypotheses about topics such as perception, learning, memory, emotion, and motivation.

They use a variety of techniques to measure and analyze behaviour and mental processes, including behavioural observations, self-report measures, physiological recordings, and computer simulations. The findings of experimental psychology studies can have important implications for a wide range of fields, including education, healthcare, and public policy.

Experimental Psychology, Psychologists have long tried to gain insight into how we perceive the world, to understand what motivates our behavior. They have made great strides in lifting that veil of mystery. In addition to providing us with food for stimulating party conversations, some of the most famous psychological experiments of the last century reveal surprising and universal truths about nature.

Throughout the history of psychology, revolutionary experiments have reshaped our comprehension of the human mind. These 11 experiments are pivotal, providing deep insights into human behaviour, cognition, and the intricate facets of human nature.

1. Kohler and the Chimpanzee experiment

Wolfgang Kohler studied the insight process by observing the behaviour of chimpanzees in a problem situation. In the experimental situation, the animals were placed in a cage outside of which food, for example, a banana, was stored. There were other objects in the cage, such as sticks or boxes. The animals participating in the experiment were hungry, so they needed to get to the food. At first, the chimpanzee used sticks mainly for playful activities; but suddenly, in the mind of the hungry chimpanzee, a relationship between sticks and food developed.

The cane, from an object to play with, became an instrument through which it was possible to reach the banana placed outside the cage. There has been a restructuring of the perceptual field: Kohler stressed that the appearance of the new behaviour was not the result of random attempts according to a process of trial and error. It is one of the first experiments on the intelligence of chimpanzees.

2. Harlow’s experiment on attachment with monkeys

In a scientific paper (1959), Harry F. Harlow described how he had separated baby rhesus monkeys from their mothers at birth, and raised them with the help of “puppet mothers”: in a series of experiments he compared the behavior of monkeys in two situations:

Little monkeys with a puppet mother without a bottle, but covered in a soft, fluffy, and furry fabric. Little monkeys with a “puppet” mother that supplied food, but was covered in wire. The little monkeys showed a clear preference for the “furry” mother, spending an average of fifteen hours a day attached to her, even though they were exclusively fed by the “suckling” puppet mother. conclusions of the Harlow experiment: all the experiments showed that the pleasure of contact elicited attachment behaviours, but the food did not.

3. The Strange Situation by Mary Ainsworth

Building on Bowlby’s attachment theory, Mary Ainsworth and colleagues (1978) have developed an experimental method called the Strange Situation, to assess individual differences in attachment security. The Strange Situation includes a series of short laboratory episodes in a comfortable environment and the child’s behaviors are observed.

Ainsworth and colleagues have paid special attention to the child’s behaviour at the time of reunion with the caregiver after a brief separation, thus identifying three different attachment patterns or styles, so called from that moment on. kinds of attachment according to Mary Ainsworth:

Secure attachment (63% of the dyads examined) Anxious-resistant or ambivalent (16%) Avoidant (21%) The Strange Situation by Mary Ainsworth

In a famous 1971 experiment, known as the Stanford Prison, Zimbardo and a team of collaborators reproduced a prison in the garages of Stanford University to study the behaviour of subjects in a context of very particular and complex dynamics. Let’s see how it went and the thoughts on the Stanford prison experiment. The participants (24 students) were randomly divided into two groups:

“ Prisoners “. The latter were locked up in three cells in the basement of a University building for six days; they were required to wear a white robe with a paper over it and a chain on the right ankle. “ Guards “. The students who had the role of prison guards had to watch the basement, choose the most appropriate methods to maintain order, and make the “prisoners” perform various tasks; they were asked to wear dark glasses and uniforms, and never to be violent towards the participants of the opposite role. However, the situation deteriorated dramatically: the fake police officers very soon began to seriously mistreat and humiliate the “detainees”, so it was decided to discontinue the experiment.

4. Jane Elliot’s Blue Eyes Experiment

On April 5, 1968, in a small school in Riceville, Iowa, Professor Jane Elliot decided to give a practical lesson on racism to 28 children of about eight years of age through the blue eyes brown eyes experiment.

“Children with brown eyes are the best,” the instructor began. “They are more beautiful and intelligent.” She wrote the word “melanin” on the board and explained that it was a substance that made people intelligent. Dark-eyed children have more, so they are more intelligent, while blue-eyed children “go hand in hand.”

In a very short time, the brown-eyed children began to treat their blue-eyed classmates with superiority, who in turn lost their self-confidence. A very good girl started making mistakes during arithmetic class, and at recess, she was approached by three little friends with brown eyes “You have to apologize because you get in their way and because we are the best,” said one of them. The girl hastened to apologize. This is one of the psychosocial experiments demonstrating how beliefs and prejudices play a role.

5. The Bobo de Bbandura doll

Albert Bandura gained great fame for the Bobo doll experiment on child imitation aggression, where:

A group of children took as an example, by visual capacity, the adults in a room, without their behaviour being commented on, hit the Bobo doll. Other contemporaries, on the other hand, saw adults sitting, always in absolute silence, next to Bobo.

Finally, all these children were brought to a room full of toys, including a doll like Bobo. Of the 10 children who hit the doll, 8 were those who had seen it done before by an adult. This explains how if a model that we follow performs a certain action, we are tempted to imitate it and this happens especially in children who still do not have the experience to understand for themselves if that behaviour is correct or not.

6. Milgram’s experiment

The Milgram experiment was first carried out in 1961 by psychologist Stanley Milgram, as an investigation into the degree of our deference to authority. A subject is invited to give an electric shock to an individual playing the role of the student, positioned behind a screen when he does not answer a question correctly. An authorized person then tells the subject to gradually increase the intensity of the shock until the student screams in pain and begs to stop.

No justification is given, except for the fact that the authorized person tells the subject to obey. In reality, it was staged: there was absolutely no electric shock given, but in the experiment two-thirds of the subjects were influenced by what they thought was a 450-volt shock, simply because a person in authority told them they would not be responsible for it. nothing.

7. little Albert

We see little Albert’s experiment on unconditioned stimulus, which must be the most famous psychological study. John Watson and Rosalie Raynor showed a white laboratory rat to a nine-month-old boy, little Albert. At first, the boy showed no fear, but then Watson jumped up from behind and made him flinch with a sudden noise by hitting a metal bar with a hammer. Of course, the noise frightened little Albert, who began to cry.

Every time the rat was brought out, Watson and Raynor would rattle the bar with their hammer to scare the poor boy away. Soon the mere sight of the rat was enough to reduce little Albert to a trembling bundle of nerves: he had learned to fear the sight of a rat, and soon afterwards began to fear a series of similar objects shown to him.

8. Pavlov’s dog

Ivan Pavlov’s sheepdog became famous for his experiments that led him to discover what we call “classical conditioning” or “Pavlovian reflex” and is still a very famous psychological experiment today. Hardly any other psychological experiment is cited so often and with such gusto as Pavlov’s theory expounded in 1905: the Russian physiologist had been impressed by the fact that his dogs did not begin to drool at the sight of food, but rather when they heard it. to the laboratory employees who took it away.

He researched it and ordered a buzzer to ring every time it was mealtime. Very soon the sound of the doorbell was enough for the dogs to start drooling: they had connected the signal to the arrival of food.

9. Asch’s experiment

It is about a social psychology experiment carried out in 1951 by the Polish psychologist Solomon Asch on the influence of the majority and social conformity.

The experiment is based on the idea that being part of a group is a sufficient condition to change a person’s actions, judgments, and visual perceptions. The very simple experiment consisted of asking the subjects involved to associate line 1 drawn on a white sheet with the corresponding one, choosing between three different lines A, B, and C present on another sheet. Only one was identical to the other, while the other two were longer or shorter.

The experimentation was carried out in three phases. As soon as one of the subjects, Asch’s accomplice gave a wrong answer associating line 1 with the wrong one, the other members of the group also made the same mistake, even though the correct answer was more than obvious. The participants questioned the reason for this choice and responded that aware of the correct answer, they had decided to conform to the group, adapting to those who had preceded them.

psychotherapy definition types and techniques | Psychotherapy vs therapy Psychologyorg.com

10. Rosenbaum’s experiment

Among the most interesting investigations in this field, an experiment carried out by David Rosenhan (1923) to document the low validity of psychiatric diagnoses stands out. Rosenhan admitted eight assistants to various psychiatric hospitals claiming psychotic symptoms, but once they entered the hospital they behaved as usual.

Despite this, they were held on average for 19 days, with all but one being diagnosed as “psychotic”. One of the reasons why the staff is not aware of the “normality” of the subjects, is, according to Rosenhan, the very little contact between the staff and the patients.

11. Bystander Effect (1968)

The Bystander Effect studied in 1968 after the tragic case of Kitty Genovese, explores how individuals are less likely to intervene in emergencies when others are present. The original research by John Darley and Bibb Latané involved staged scenarios where participants believed they were part of a discussion via intercom.

In the experiment, participants were led to believe they were communicating with others about personal problems. Unknown to them, the discussions were staged, and at a certain point, a participant (confederate) pretended to have a seizure or needed help.

The results were startling. When participants believed they were the sole witness to the emergency, they responded quickly and sought help. However, when they thought others were also present (but were confederates instructed to not intervene), the likelihood of any individual offering help significantly decreased. This phenomenon became known as the Bystander Effect.

The diffusion of responsibility, where individuals assume others will take action, contributes to this effect. The presence of others creates a diffusion of responsibility among bystanders, leading to a decreased likelihood of any single individual taking action.

This experiment highlighted the social and psychological factors influencing intervention during emergencies and emphasized the importance of understanding bystander behaviour in critical situations.

The journey through the “11 Most Influential Psychological Experiments in History” illuminates the profound impact these studies have had on our understanding of human behaviour, cognition, and social dynamics.

Each experiment stands as a testament to the dedication of pioneering psychologists who dared to delve into the complexities of the human mind. From Milgram’s obedience studies to Zimbardo’s Stanford Prison Experiment, these trials have shaped not only the field of psychology but also our societal perceptions and ethical considerations in research.

They serve as timeless benchmarks, reminding us of the ethical responsibilities and the far-reaching implications of delving into the human psyche. The enduring legacy of these experiments lies not only in their scientific contributions but also in the ethical reflections they provoke, urging us to navigate the boundaries of knowledge with caution, empathy, and an unwavering commitment to understanding the intricacies of our humanity.

What is the most famous experiment in the history of psychology?

One of the most famous experiments is the Milgram Experiment, conducted by Stanley Milgram in the 1960s. It investigated obedience to authority figures and remains influential in understanding human behaviour.

Who wrote the 25 most influential psychological experiments in history?

The book “The 25 Most Influential Psychological Experiments in History” was written by Michael Shermer, a science writer and historian of science.

What is the history of experimental psychology?

Experimental psychology traces back to Wilhelm Wundt, often considered the father of experimental psychology. He established the first psychology laboratory in 1879 at the University of Leipzig, marking the formal beginning of experimental psychology as a distinct field.

What was the psychological experiment in the 1960s?

Many significant psychological experiments were conducted in the 1960s. One notable example is the Stanford Prison Experiment led by Philip Zimbardo, which examined the effects of situational roles on behaviour.

Who was the first experimental psychologist?

Wilhelm Wundt is often regarded as the first experimental psychologist due to his establishment of the first psychology laboratory and his emphasis on empirical research methods in psychology.

If you want to read more articles similar to  The 11 Most Influential Psychological Experiments in History , we recommend that you enter our  Psychology  category.

I'm Waqar, a passionate psychologist and dedicated content writer. With a deep interest in understanding human behavior, I aim to share insights and knowledge in the field of psychology through this blog. Feel free to reach out for collaborations, queries, or discussions. Let's dig into the fascinating world of psychology together!

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Famous Experiments

The Most Influential Psychological Experiments in History

Solomon Asch Conformity Line Experiment Study

Bandura's Bobo Doll Experiment on Social Learning

Reviewed by Olivia Guy-Evans, MSc

John Money Gender Experiment: Reimer Twins

Reviewed by Saul McLeod, PhD

Van Ijzendoorn & Kroonenberg: Cultural Variations in Attachment

Jean piaget, behaviorism, neuroscience.

Jean Piaget's theory of cognitive development suggests that children move through four different stages of intellectual development which reflect the increasing sophistication of children's thoughts. Child development is determined by biological maturation and interaction with the environment.

Learn More: Piaget's Stages of Cognitive Development

Behaviorism is a theory of learning that states all behaviors are learned through interaction with the environment through a process called conditioning. Thus, behavior is simply a response to environmental stimuli.

Learn More: Behaviorist Approach in Psychology

Sigmund Freud (1856 to 1939) was the founding father of psychoanalysis, a method for treating mental illness and a theory that explains human behavior. His theories are clinically derived, based on what his patients told him during therapy.

Learn More: Sigmund Freud's Influence on Psychology

An approach is a perspective that involves certain assumptions about human behavior: the way people function, which aspects of them are worthy of study, and what research methods are appropriate for undertaking this study. The five major psychological perspectives are biological, psychodynamic, behaviorist, cognitive, and humanistic.

Learn More: Major Perspectives in Modern Psychology

Neuroscience is the branch of science concerned with studying the nervous system. It is a multidisciplinary field integrating numerous perspectives from biology, psychology, and medicine. It consists of several sub-fields ranging from the study of neurochemicals to the study of behavior and thought.

Learn More: What is Neuroscience?

Frequent Asked Questions

Is psychodynamic same as psychoanalytic?

The words psychodynamic and psychoanalytic are often confused. Remember that Freud’s theories were psychoanalytic, whereas the term ‘psychodynamic’ refers to both his theories and those of his followers, such as Carl Jung, Anna Freud, and Erik Erikson.

Learn More: Psychodynamic Approach

What is developmental psychology?

Developmental psychology is a scientific approach which aims to explain how thinking, feeling, and behavior change throughout a person’s life. A significant proportion of theories within this discipline focus upon development during childhood, as this is the period during an individual’s lifespan when the most change occurs.

Learn More: Developmental Psychology

What is Freud’s psychosexual theory?

Sigmund Freud proposed that personality development in childhood takes place during five psychosexual stages, which are the oral, anal, phallic, latency, and genital stages.

During each stage, sexual energy (libido) is expressed in different ways and through different body parts.

Learn More: Freud’s Psychosexual Stages of Development

What Is object permanence in Piaget’s theory?

Object permanence means knowing that an object still exists, even if it is hidden. It requires the ability to form a mental representation (i.e. a schema) of the object.

The attainment of object permanence generally signals the transition from the sensorimotor stage to the  preoperational stage of development .

Learn More: What Is Object Permanence According To Piaget?

What is the difference between a psychology and sociology?

Psychology studies the mind of an individual to understand human behavior and social and emotional reactions, whereas sociology looks beyond individuals and examines societal institutions and groups of people.

Learn More: Similarities and Differences Between Sociology and Psychology

Explore Famous Experiments

Dement and Kleitman (1957)

Henry Gustav Molaison: The Curious Case of Patient H.M. 

Held and Hein (1963) Kitten carosel

Harry Harlow Theory & Rhesus Monkey Experiments in Psychology

Hawthorne Effect: Definition, How It Works, and How to Avoid It

Hofling Hospital Experiment (1966)

Hodges and Tizard (1989): Attachment Research Study

What Happened to Kitty Genovese

Konrad Lorenz: Theory of Imprinting in Psychology

Little Hans - Freudian Case Study

Little Albert Experiment (Watson & Rayner)

Little Peter, Cover-Jones (1924)

Loftus and Palmer (1974): Car Crash Experiment

Mary Ainsworth: Strange Situation Experiment & Attachment Theory

Stanford Marshmallow Test Experiment

Stanley Milgram Shock Experiment

Phineas Gage: His Accident and Impact on Psychology

Pavlov’s Dogs Experiment and Pavlovian Conditioning Response

Piliavin (1969) Subway Study

Serial Position Effect (Glanzer & Cunitz, 1966)

Rosenhan (1973) Experiment - 'On being sane in insane places'

Robbers Cave Experiment | Realistic Conflict Theory

Visual Cliff Experiment (Gibson & Walk, 1960)

Skinner Box: What Is an Operant Conditioning Chamber?

Stanford Prison Experiment: Zimbardo's Famous Study

Breakthroughs and Discoveries in Psychological Science: 2020 Year in Review

• Psychological Science

Many of the major news stories of 2020 were closely tied to understanding human behavior, including efforts to contain the spread of COVID-19, understand political divides and social conflicts, and address enduring racial disparities and inequality.  

A wealth of research published by the Association for Psychological Science (APS) addresses these and other important topics. The following is a selection of some of APS’s most newsworthy research and highly cited publications from 2020. These stories emphasize the importance of peer-reviewed psychological research and its impact on society.  

Top 10 APS News Releases of 2020, Metrics Provided by  Newswise  

Romance, Scent, and Sleep: The Stuff that Dreams Are Made Of : Research published in the journal  Psychological Science  suggests that the scent of a romantic partner can improve your quality of sleep. This is true regardless of whether you are consciously aware that the scent is even present.  

Violent Video Games and Aggression: The Connection Is Dubious, at Best : The coronavirus pandemic put a damper on many traditional summertime activities for kids, giving them more opportunity to socialize with friends virtually through online gaming. But many hours of extra screen time worried some parents, especially in light of a 2015 report linking violent video games with aggressive behavior in children. A reanalysis of previous findings published in the journal  Perspectives on Psychological Science  found no clear link between video game violence and aggression in children. 

Stemming the Spread of Misinformation on Social Media : The dangers of COVID-19 could worsen if misinformation on social media continues to spread unchecked, according to research published in  Psychological Science . Though there is no practical way to fully stem the tide of harmful misinformation on social media, certain tactics could help improve the quality of information that people share online about this deadly disease. 

Psychological Science and COVID-19: Conspiracy Theories : Why are conspiracy theories so popular? Who believes them? Why do people believe them? What are some of the consequences of conspiracy theories, and can such theories be harmful? These questions are explored by Karen Douglas, professor of social psychology at the University of Kent, UK, whose research focuses on beliefs in conspiracy theories.  

Pandemic Effects on Marriage and Relationships : Beyond its economic toll, COVID-19 is also having a negative impact on many relationships. Expert commentary from Paula Pietromonaco, professor emerita at the University of Massachusetts, Amherst, explores this facet of the pandemic and how interactions in marital and other close relationships shape each partner’s emotional and physical health. 

Trigger Warnings Fail to Help and May Even Harm : A study published in the journal  Clinical Psychological Science  shines light on the value and potential harm of trigger warnings, the term used to alert readers or viewers to potentially unsettling content. This research suggests that trigger warnings offer little to no help in avoiding painful memories and can even be harmful for the survivors of past emotional trauma.  

Contracting COVID-19: Lifestyle and Social Connections May Play a Role : Research published in  Psychological Science  indicates that unhealthy lifestyle choices, including smoking and lack of exercise, along with emotional stressors like social isolation and interpersonal conflicts are important risk factors for developing upper respiratory infections. It is possible these same factors also increase the risk of contracting COVID-19. 

Does Bedtime Media Use Harm Children’s Sleep? Only If They Struggle to Self-Regulate Behavior : Throughout the COVID-19 pandemic, one concern for many parents has been the impact of additional TV or computer screen time on their children and their already disrupted sleep habits. A study published in  Psychological Science  found that media use in the hour preceding bedtime impacts the sleep only of children who struggle to self-regulate their behavior. 

Health and Happiness Depend on Each Other, Psychological Science Says : This research adds to the growing body of evidence that happiness not only feels good, but it is also good for your physical health. Research published in  Psychological Science  shows that both online and in-person psychological interventions—tactics specifically designed to boost subjective well-being—have positive effects on self-reported physical health.  

Claiming Journalism Is ‘Fake News’ May Satisfy a Personal Need for an Orderly World : Research published in  Psychological Science  reveals that the degree to which people level accusations of fake news against news outlets is at least partially associated with a personal need for an orderly and structured environment. 

Top 10 APS Journal Articles Based on  Altmetric Attention Scores  

Aging in an Era of Fake News : Older adults appear to be particularly susceptible to misinformation (e.g., they shared the most fake news during the 2016 U.S. election). In  Current Directions in Psychological Science , researchers suggest that social changes in late adulthood, including difficulty in detecting lies and less emphasis on accuracy when communicating, might be partly responsible for susceptibility to misinformation. Moreover, older adults are less experienced with social media and may struggle to evaluate the veracity of content. Interventions that take into account older adults’ social changes and digital literacy might help to reduce their susceptibility to fake news.     Sex Differences in Mate Preferences Across 45 Countries: A Large-Scale Replication :  Research published in  Psychological Science  seems to support the popular perception that men are more likely to prefer attractive young mates, and women are more likely to prefer older mates with financial prospects. These sex differences were universal across the 45 countries surveyed. In countries where gender equality was higher, both sexes appeared to have mates closer to their own age. Contrary to older studies, this study found that gender equality did not predict other differences in mate preferences, such as financial prospects. Also, different countries’ rates of communicable and infectious diseases did not predict sex differences or preferences. 

What Is the Test-Retest Reliability of Common Task-Functional MRI Measures? New Empirical Evidence and a Meta-Analysis : The reliability of measuring brain activity using task functional MRI (fMRI) for predicting disease risk and outcomes appears to be low. In  Psychological Science , researchers present a meta-analysis of prior research and an analysis of test-retest reliability of brain activity in certain regions across 11 common fMRI tasks. The authors found that reliability across studies was low, and test-retest studies did not reliably show activity in the same areas of interest for the same tasks. These findings suggest that current task-fMRI measures are not suitable for predicting clinical outcomes or studying individual differences.    Racial Inequality in Psychological Research: Trends of the Past and Recommendations for the Future :  Systematic inequality exists within psychological research.  This is the conclusion researchers published in  Perspectives on Psychological Science  after querying more than 26,000 articles published between 1974 and 2018 in top-tier psychology journals. Most publications are edited by White editors, and the few publications that highlight race were written by White authors and had few participants of color. These findings suggest the need to diversify editing, writing, and participation in psychological science. To this end, the researchers provide a set of actionable recommendations for journals and authors.  

Your Brain Is Not an Onion With a Tiny Reptile Inside : A paper in  Current Directions in Psychological Science  describes a model of neural evolution that challenges the widespread misconception that as vertebrate animals evolved, they added “newer” brain structures to the “older” existing ones, enabling them to have more complex psychological functions (e.g., language). Neurobiologists have long discredited this misconception that the reptile brain is still part of the human brain, which just added more layers. The authors provide examples of how this inaccurate view of brain evolution has impeded progress in psychology. 

The Emotional Path to Action: Empathy Promotes Physical Distancing and Wearing of Face Masks During the COVID-19 Pandemic : Empathy for people most vulnerable to COVID-19 appears to motivate wearing face masks and practicing social distancing, according to an article published in  Psychological Science . Participants who showed more empathy for the most vulnerable to the virus were more likely to report social-distancing practices. In two experiments, inducing empathy resulted in higher motivation to wear face masks and to practice social distancing than simply informing participants about the importance of these practices, in particular for those most vulnerable to the virus.  

Fighting COVID-19 Misinformation on Social Media: Experimental Evidence for a Scalable Accuracy-Nudge Intervention :  Nudging people to think about the accuracy of news headlines might be a simple way to improve their choices about what to share on social media. When directly asked about the accuracy of COVID-19-related news, participants in a study published in  Psychological Science  were better at discriminating between true and false than when asked simply to decide whether to share it. Similarly, having participants judge the accuracy of non-COVID-19-related headlines increased their discernment about the accuracy of COVID-19-related articles and the quality of their subsequent intentions to share them.  

How Firm Are the Foundations of Mind-Set Theory? The Claims Appear Stronger Than the Evidence : Mind-set theory proposes that the beliefs one has about whether attributes are malleable ( growth mind-set ) or unchangeable ( fixed mind-set ) influence one’s motivation, type of goals, persistence, and resilience. Contrary to what the mind-set theory would predict, researchers publishing in  Psychological Science  tested 438 students and found weak associations (<.20) between mind-set, goal orientation, response to challenge, belief in effort, cognitive ability, and intelligence. The researchers suggest that these results may indicate that some claims about mind-set might be overstated. 

The Future of Women in Psychological Science :  A team of researchers analyzed 10 topics relevant for women’s professional prospects in psychological science: career advancement; financial compensation; service assignment and practices; lifestyle roles and work–family conflict; gender biases; prevalence and perceptions of positions of power; intersectionality; harassment and incivility; agency, self-esteem, and self-promotion; and lack of belonging. In  Perspectives on Psychological Science , the authors discuss empirical evidence for each of these issues and clarify gender gaps and positive change in the hope that a better understanding of these issues will spark conversation and help to mitigate remaining gender differences in the field. 

Can Bad Be Good? The Attraction of a Darker Self : We prefer fictional villains who are similar to us, according to research in  Psychological Science . Researchers explored data from an online platform that allows users to become “fans” of characters and take a quiz to evaluate their similarity with them. Individuals preferred villains who were similar to themselves. A series of laboratory studies also found an association between similarity of negative traits, when the villain was fictional but not when the villain was a real person, and attraction to the villain. 

Stories in Action

Stories may complement established policy tools. Walsh and colleagues define the elements of storytelling and discuss stories’ key features and functions, providing design principles for policymakers interested in building stories. 

SAGE 10-Year Impact Awards Honor Two APS Articles

Two 2011 APS journal articles exploring the rise of Amazon Mechanical Turk (MTurk) and the risk of accepting false-positive findings have received SAGE Publishing’s third annual 10-Year Impact Awards.

Letter from the Editor: A New Chapter for the Observer

After nearly 40 years in print, the APS member magazine is going all-digital.

Privacy Overview

7 Famous Psychology Experiments

Many famous experiments studying human behavior have impacted our fundamental understanding of psychology. Though some could not be repeated today due to breaches in ethical boundaries, that does not diminish the significance of those psychological studies. Some of these important findings include a greater awareness of depression and its symptoms, how people learn behaviors through the process of association and how individuals conform to a group.

Below, we take a look at seven famous psychological experiments that greatly influenced the field of psychology and our understanding of human behavior.

The Little Albert Experiment, 1920

A John’s Hopkins University professor, Dr. John B. Watson, and a graduate student wanted to test a learning process called classical conditioning. Classical conditioning involves learning involuntary or automatic behaviors by association, and Dr. Watson thought it formed the bedrock of human psychology.

A nine-month-old toddler, dubbed “Albert B,” was volunteered for Dr. Watson and Rosalie Rayner ‘s experiment. Albert played with white furry objects, and at first, the toddler displayed joy and affection. Over time, as he played with the objects, Dr. Watson would make a loud noise behind the child’s head to frighten him. After numerous trials, Albert was conditioned to be afraid when he saw white furry objects.

The study proved that humans could be conditioned to enjoy or fear something, which many psychologists believe could explain why people have irrational fears and how they may have developed early in life. This is a great example of experimental study psychology.

Stanford Prison Experiment, 1971

Stanford professor Philip Zimbardo wanted to learn how individuals conformed to societal roles. He wondered, for example, whether the tense relationship between prison guards and inmates in jails had more to do with the personalities of each or the environment.

During Zimbardo’s experiment , 24 male college students were assigned to be either a prisoner or a guard. The prisoners were held in a makeshift prison inside the basement of Stanford’s psychology department. They went through a standard booking process designed to take away their individuality and make them feel anonymous. Guards were given eight-hour shifts and tasked to treat the prisoners just like they would in real life.

Zimbardo found rather quickly that both the guards and prisoners fully adapted to their roles; in fact, he had to shut down the experiment after six days because it became too dangerous. Zimbardo even admitted he began thinking of himself as a police superintendent rather than a psychologist. The study confirmed that people will conform to the social roles they’re expected to play, especially overly stereotyped ones such as prison guards.

“We realized how ordinary people could be readily transformed from the good Dr. Jekyll to the evil Mr. Hyde,” Zimbardo wrote.

The Asch Conformity Study, 1951

Solomon Asch, a Polish-American social psychologist, was determined to see whether an individual would conform to a group’s decision, even if the individual knew it was incorrect. Conformity is defined by the American Psychological Association as the adjustment of a person’s opinions or thoughts so that they fall closer in line with those of other people or the normative standards of a social group or situation.

In his experiment , Asch selected 50 male college students to participate in a “vision test.” Individuals would have to determine which line on a card was longer. However, the individuals at the center of the experiment did not know that the other people taking the test were actors following scripts, and at times selected the wrong answer on purpose. Asch found that, on average over 12 trials, nearly one-third of the naive participants conformed with the incorrect majority, and only 25 percent never conformed to the incorrect majority. In the control group that featured only the participants and no actors, less than one percent of participants ever chose the wrong answer.

Asch’s experiment showed that people will conform to groups to fit in (normative influence) because of the belief that the group was better informed than the individual. This explains why some people change behaviors or beliefs when in a new group or social setting, even when it goes against past behaviors or beliefs.

The Bobo Doll Experiment, 1961, 1963

Stanford University professor Albert Bandura wanted to put the social learning theory into action. Social learning theory suggests that people can acquire new behaviors “through direct experience or by observing the behavior of others.” Using a Bobo doll , which is a blow-up toy in the shape of a life-size bowling pin, Bandura and his team tested whether children witnessing acts of aggression would copy them.

Bandura and two colleagues selected 36 boys and 36 girls between the ages of 3 and 6 from the Stanford University nursery and split them into three groups of 24. One group watched adults behaving aggressively toward the Bobo doll. In some cases, the adult subjects hit the doll with a hammer or threw it in the air. Another group was shown an adult playing with the Bobo doll in a non-aggressive manner, and the last group was not shown a model at all, just the Bobo doll.

After each session, children were taken to a room with toys and studied to see how their play patterns changed. In a room with aggressive toys (a mallet, dart guns, and a Bobo doll) and non-aggressive toys (a tea set, crayons, and plastic farm animals), Bandura and his colleagues observed that children who watched the aggressive adults were more likely to imitate the aggressive responses.

Unexpectedly, Bandura found that female children acted more physically aggressive after watching a male subject and more verbally aggressive after watching a female subject. The results of the study highlight how children learn behaviors from observing others.

The Learned Helplessness Experiment, 1965

Martin Seligman wanted to research a different angle related to Dr. Watson’s study of classical conditioning. In studying conditioning with dogs, Seligman made an astute observation : the subjects, which had already been conditioned to expect a light electric shock if they heard a bell, would sometimes give up after another negative outcome, rather than searching for the positive outcome.

Under normal circumstances, animals will always try to get away from negative outcomes. When Seligman tested his experiment on animals who hadn’t been previously conditioned, the animals attempted to find a positive outcome. Oppositely, the dogs who had been already conditioned to expect a negative response assumed there would be another negative response waiting for them, even in a different situation.

The conditioned dogs’ behavior became known as learned helplessness, the idea that some subjects won’t try to get out of a negative situation because past experiences have forced them to believe they are helpless. The study’s findings shed light on depression and its symptoms in humans.

Is a Psychology Degree Right for You?

Develop you strength in psychology, communication, critical thinking, research, writing, and more.

The Milgram Experiment, 1963

In the wake of the horrific atrocities carried out by Nazi Germany during World War II, Stanley Milgram wanted to test the levels of obedience to authority. The Yale University professor wanted to study if people would obey commands, even when it conflicted with the person’s conscience.

Participants of the condensed study , 40 males between the ages of 20 and 50, were split into learners and teachers. Though it seemed random, actors were always chosen as the learners, and unsuspecting participants were always the teachers. A learner was strapped to a chair with electrodes in one room while the experimenter äóñ another actor äóñ and a teacher went into another.

The teacher and learner went over a list of word pairs that the learner was told to memorize. When the learner incorrectly paired a set of words together, the teacher would shock the learner. The teacher believed the shocks ranged from mild all the way to life-threatening. In reality, the learner, who intentionally made mistakes, was not being shocked.

As the voltage of the shocks increased and the teachers became aware of the believed pain caused by them, some refused to continue the experiment. After prodding by the experimenter, 65 percent resumed. From the study, Milgram devised the agency theory , which suggests that people allow others to direct their actions because they believe the authority figure is qualified and will accept responsibility for the outcomes. Milgram’s findings help explain how people can make decisions against their own conscience, such as when participating in a war or genocide.

The Halo Effect Experiment, 1977

University of Michigan professors Richard Nisbett and Timothy Wilson were interested in following up a study from 50 years earlier on a concept known as the halo effect . In the 1920s, American psychologist Edward Thorndike researched a phenomenon in the U.S. military that showed cognitive bias. This is an error in how we think that affects how we perceive people and make judgements and decisions based on those perceptions.

In 1977, Nisbett and Wilson tested the halo effect using 118 college students (62 males, 56 females). Students were divided into two groups and were asked to evaluate a male Belgian teacher who spoke English with a heavy accent. Participants were shown one of two videotaped interviews with the teacher on a television monitor. The first interview showed the teacher interacting cordially with students, and the second interview showed the teacher behaving inhospitably. The subjects were then asked to rate the teacher’s physical appearance, mannerisms, and accent on an eight-point scale from appealing to irritating.

Nisbett and Wilson found that on physical appearance alone, 70 percent of the subjects rated the teacher as appealing when he was being respectful and irritating when he was cold. When the teacher was rude, 80 percent of the subjects rated his accent as irritating, as compared to nearly 50 percent when he was being kind.

The updated study on the halo effect shows that cognitive bias isn’t exclusive to a military environment. Cognitive bias can get in the way of making the correct decision, whether it’s during a job interview or deciding whether to buy a product that’s been endorsed by a celebrity we admire.

How Experiments Have Impacted Psychology Today

Contemporary psychologists have built on the findings of these studies to better understand human behaviors, mental illnesses, and the link between the mind and body. For their contributions to psychology, Watson, Bandura, Nisbett and Zimbardo were all awarded Gold Medals for Life Achievement from the American Psychological Foundation. Become part of the next generation of influential psychologists with King University’s online bachelor’s in psychology . Take advantage of King University’s flexible online schedule and complete the major coursework of your degree in as little as 16 months. Plus, as a psychology major, King University will prepare you for graduate school with original research on student projects as you pursue your goal of being a psychologist.

61 intriguing psychology research topics to explore

Last updated

11 January 2024

Reviewed by

Brittany Ferri, PhD, OTR/L

Short on time? Get an AI generated summary of this article instead

Psychology is an incredibly diverse, critical, and ever-changing area of study in the medical and health industries. Because of this, it’s a common area of study for students and healthcare professionals.

We’re walking you through picking the perfect topic for your upcoming paper or study. Keep reading for plenty of example topics to pique your interest and curiosity.

• How to choose a psychology research topic

Exploring a psychology-based topic for your research project? You need to pick a specific area of interest to collect compelling data. 

Use these tips to help you narrow down which psychology topics to research:

Focus on a particular area of psychology

The most effective psychological research focuses on a smaller, niche concept or disorder within the scope of a study. 

Psychology is a broad and fascinating area of science, including everything from diagnosed mental health disorders to sports performance mindset assessments. 

This gives you plenty of different avenues to explore. Having a hard time choosing? Check out our list of 61 ideas further down in this article to get started.

Read the latest clinical studies

Once you’ve picked a more niche topic to explore, you need to do your due diligence and explore other research projects on the same topic. 

This practice will help you learn more about your chosen topic, ask more specific questions, and avoid covering existing projects. 

For the best results, we recommend creating a research folder of associated published papers to reference throughout your project. This makes it much easier to cite direct references and find inspiration down the line.

Find a topic you enjoy and ask questions

Once you’ve spent time researching and collecting references for your study, you finally get to explore. 

Whether this research project is for work, school, or just for fun, having a passion for your research will make the project much more enjoyable. (Trust us, there will be times when that is the only thing that keeps you going.) 

Now you’ve decided on the topic, ask more nuanced questions you might want to explore. 

If you can, pick the direction that interests you the most to make the research process much more enjoyable.

• 61 psychology topics to research in 2024

Need some extra help starting your psychology research project on the right foot? Explore our list of 61 cutting-edge, in-demand psychology research topics to use as a starting point for your research journey.

• Psychology research topics for university students

As a university student, it can be hard to pick a research topic that fits the scope of your classes and is still compelling and unique. 

Here are a few exciting topics we recommend exploring for your next assigned research project:

Mental health in post-secondary students

Seeking post-secondary education is a stressful and overwhelming experience for most students, making this topic a great choice to explore for your in-class research paper. 

Examples of post-secondary mental health research topics include:

Student mental health status during exam season

Mental health disorder prevalence based on study major

The impact of chronic school stress on overall quality of life

The impacts of cyberbullying

Cyberbullying can occur at all ages, starting as early as elementary school and carrying through into professional workplaces. 

Examples of cyberbullying-based research topics you can study include:

The impact of cyberbullying on self-esteem

Common reasons people engage in cyberbullying 

Cyberbullying themes and commonly used terms

Cyberbullying habits in children vs. adults

The long-term effects of cyberbullying

• Clinical psychology research topics

If you’re looking to take a more clinical approach to your next project, here are a few topics that involve direct patient assessment for you to consider:

Chronic pain and mental health

Living with chronic pain dramatically impacts every aspect of a person’s life, including their mental and emotional health. 

Here are a few examples of in-demand pain-related psychology research topics:

The connection between diabetic neuropathy and depression

Neurological pain and its connection to mental health disorders

Efficacy of meditation and mindfulness for pain management

The long-term effects of insomnia

Insomnia is where you have difficulty falling or staying asleep. It’s a common health concern that impacts millions of people worldwide. 

This is an excellent topic because insomnia can have a variety of causes, offering many research possibilities. 

Here are a few compelling psychology research topics about insomnia you could investigate:

The prevalence of insomnia based on age, gender, and ethnicity

Insomnia and its impact on workplace productivity

The connection between insomnia and mental health disorders

Efficacy and use of melatonin supplements for insomnia

The risks and benefits of prescription insomnia medications

Lifestyle options for managing insomnia symptoms

The efficacy of mental health treatment options

Management and treatment of mental health conditions is an ever-changing area of study. If you can witness or participate in mental health therapies, this can make a great research project. 

Examples of mental health treatment-related psychology research topics include:

The efficacy of cognitive behavioral therapy (CBT) for patients with severe anxiety

The benefits and drawbacks of group vs. individual therapy sessions

Music therapy for mental health disorders

Electroconvulsive therapy (ECT) for patients with depression 

• Controversial psychology research paper topics

If you are looking to explore a more cutting-edge or modern psychology topic, you can delve into a variety of controversial and topical options:

The impact of social media and digital platforms

Ever since access to internet forums and video games became more commonplace, there’s been growing concern about the impact these digital platforms have on mental health. 

Examples of social media and video game-related psychology research topics include:

The effect of edited images on self-confidence

How social media platforms impact social behavior

Video games and their impact on teenage anger and violence

Digital communication and the rapid spread of misinformation

The development of digital friendships

Psychotropic medications for mental health

In recent years, the interest in using psychoactive medications to treat and manage health conditions has increased despite their inherently controversial nature. 

Examples of psychotropic medication-related research topics include:

The risks and benefits of using psilocybin mushrooms for managing anxiety

The impact of marijuana on early-onset psychosis

Childhood marijuana use and related prevalence of mental health conditions

Ketamine and its use for complex PTSD (C-PTSD) symptom management

The effect of long-term psychedelic use and mental health conditions

• Mental health disorder research topics

As one of the most popular subsections of psychology, studying mental health disorders and how they impact quality of life is an essential and impactful area of research. 

While studies in these areas are common, there’s always room for additional exploration, including the following hot-button topics:

Anxiety and depression disorders

Anxiety and depression are well-known and heavily researched mental health disorders. 

Despite this, we still don’t know many things about these conditions, making them great candidates for psychology research projects:

Social anxiety and its connection to chronic loneliness

C-PTSD symptoms and causes

The development of phobias

Obsessive-compulsive disorder (OCD) behaviors and symptoms

Depression triggers and causes

Self-care tools and resources for depression

The prevalence of anxiety and depression in particular age groups or geographic areas

Bipolar disorder

Bipolar disorder is a complex and multi-faceted area of psychology research. 

Use your research skills to learn more about this condition and its impact by choosing any of the following topics:

Early signs of bipolar disorder

The incidence of bipolar disorder in young adults

The efficacy of existing bipolar treatment options

Bipolar medication side effects

Cognitive behavioral therapy for people with bipolar 

Schizoaffective disorder

Schizoaffective disorder is often stigmatized, and less common mental health disorders are a hotbed for new and exciting research. 

Here are a few examples of interesting research topics related to this mental health disorder:

The prevalence of schizoaffective disorder by certain age groups or geographic locations

Risk factors for developing schizoaffective disorder

The prevalence and content of auditory and visual hallucinations

Alternative therapies for schizoaffective disorder

• Societal and systematic psychology research topics

Modern society’s impact is deeply enmeshed in our mental and emotional health on a personal and community level. 

Here are a few examples of societal and systemic psychology research topics to explore in more detail:

Access to mental health services

While mental health awareness has risen over the past few decades, access to quality mental health treatment and resources is still not equitable. 

This can significantly impact the severity of a person’s mental health symptoms, which can result in worse health outcomes if left untreated. 

Explore this crucial issue and provide information about the need for improved mental health resource access by studying any of the following topics:

Rural vs. urban access to mental health resources

Access to crisis lines by location

Wait times for emergency mental health services

Inequities in mental health access based on income and location

Insurance coverage for mental health services

Systemic racism and mental health

Societal systems and the prevalence of systemic racism heavily impact every aspect of a person’s overall health.

Researching these topics draws attention to existing problems and contributes valuable insights into ways to improve access to care moving forward.

Examples of systemic racism-related psychology research topics include: 

Access to mental health resources based on race

The prevalence of BIPOC mental health therapists in a chosen area

The impact of systemic racism on mental health and self-worth

Racism training for mental health workers

The prevalence of mental health disorders in discriminated groups

LGBTQIA+ mental health concerns

Research about LGBTQIA+ people and their mental health needs is a unique area of study to explore for your next research project. It’s a commonly overlooked and underserved community.

Examples of LGBTQIA+ psychology research topics to consider include:

Mental health supports for queer teens and children

The impact of queer safe spaces on mental health

The prevalence of mental health disorders in the LGBTQIA+ community

The benefits of queer mentorship and found family

Substance misuse in LQBTQIA+ youth and adults

• Collect data and identify trends with Dovetail

Psychology research is an exciting and competitive study area, making it the perfect choice for projects or papers.

Take the headache out of analyzing your data and instantly access the insights you need to complete your next psychology research project by teaming up with Dovetail today.

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The Six Most Interesting Psychology Papers of 2015

Every year, psychologists publish a staggering amount of research—it’s impossible to read it all. Still, I gave it a shot—and here are the six papers I found most fascinating.

“ Estimating the Reproducibility of Psychological Science ,” from Science

This paper isn’t really a study; it’s the outcome of an important movement in the field of psychology. In an effort called the Reproducibility Project, researchers at dozens of universities collaborated to replicate a hundred psychology studies that were initially conducted in 2008. They ended up replicating between a third and half of the studies.

Is that result bad or good? It’s inevitable that studies won’t always be replicable—if every study could be replicated, then every researcher would be right the first time; even legitimate findings can prove fragile when you try to repeat them. All the same, the paper concludes that there is “room for improvement” in psychology, especially when it comes to “cultural practices in scientific communication.” Specifically, the authors propose that “low-power research designs combined with publication bias favoring positive results together produce a literature with upwardly biased effect sizes.”

In other words, the desire for novelty drives researchers to overestimate the conclusiveness of their own work. It’s a fascinating and valuable effort to make sure that psychology moves forward in the best way possible.

“ What Works in Inpatient Traumatic Brain Injury Rehabilitation? ,” from Archives of Physical Medicine and Rehabilitation

Finally, traumatic brain injury, or T.B.I., is becoming a topic of conversation. It’s a huge problem: in 2010, an estimated two and a half million people in the United States sustained such an injury, and between 3.1 and 5.3 million were living with long-term, or even permanent, disability due to its effects. Still, until recently, T.B.I. has been understudied. This issue of Archives of Physical Medicine and Rehabilitation is entirely devoted to the topic, carefully examining the existing evidence regarding the effects of traumatic brain injury and possible future treatments.

Some of the findings are surprising: if you’re female or Asian, you’re less likely to be given a psychotropic drug, regardless of evidence for its applicability. Some are dispiriting: it turns out that we really don’t have a good sense of what works to treat these injuries, and a kitchen-sink-like approach remains the norm. At this stage, the best predictor of your eventual outcome seems to be the severity of the injury, rather than any particular treatment you might receive. But some evidence is promising. Rehabilitation therapy, especially therapy that requires demanding physical or mental activity, does seem to help patients regain function.

“ Best Friends and Better Coping: Facilitating Psychological Resilience Through Boys’ and Girls’ Closest Friendships ,” from British Journal of Psychology

This study shows that even a single close friendship is valuable in protecting children—even the most vulnerable—against multiple psychological risk factors. It’s not a new idea, but the research is an important empirical step forward.

“ Nonpharmacological Treatments of Insomnia for Long-Term Painful Conditions ,” from Sleep

Cognitive-behavioral therapy for insomnia! As I’ve written before , it’s hard to break the cycle of sleeplessness. This study offers evidence for one therapeutic possibility. It involves elements of a traditional therapeutic approach, including “psychoeducation, sleep hygiene, stimulus control, sleep restriction, cognitive therapy, and relaxation.” Some interventions consisted of only a series of three phone calls, between sixty and ninety minutes long, in the course of sixty days, while others were as intensive as weekly two-hour sessions for seven weeks. The methods seem initially promising for both sleep quality and fatigue—but only if administered face to face, not over the phone or the Internet. The effect isn’t huge, but insomnia is an increasing problem, and any possible cure is important to note.

“ A Mechanistic Link Between Olfaction and Autism Spectrum Disorder ,” in Current Biology

Autism is difficult to study, diagnose, and pin down. This study offers a new possibility: a way to use smell as a more objective marker of potential disorder. The connection also offers insights into some of the underlying mechanisms of autism.

“ Fibroblast Growth Factor 9 Is a Novel Modulator of Negative Affect ,” from PNAS

Depression is notoriously tough to handle pharmaceutically. We still don’t know how S.S.R.I.s work, for instance—or even if they work at all. This paper offers a previously untried target for treatment: FGF9, a neurotrophin (a type of protein) that appears to play a key role in regulating embryonic development and cell differentiation and seems also to be important in regulating our emotional state. In people with severe depression, it appears to be upregulated, or expressed at too high a concentration. In animals that experience chronic stress from social defeat, FGF9 expression in the hippocampus (the part of our brain involved in memory formation, which also seems to be closely connected to depression) increases—while a related growth factor, FGF2, which is tied to lower levels of depression, decreases. It could prove a dead end, of course, but at least it offers new hope in an otherwise difficult landscape.

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50+ Research Topics for Psychology Papers

How to Find Psychology Research Topics for Your Student Paper

• Specific Branches of Psychology
• Topics Involving a Disorder or Type of Therapy
• Human Cognition
• Human Development
• Critique of Publications
• Famous Experiments
• Historical Figures
• Specific Careers
• Case Studies
• Literature Reviews
• Your Own Study/Experiment

Are you searching for a great topic for your psychology paper ? Sometimes it seems like coming up with topics of psychology research is more challenging than the actual research and writing. Fortunately, there are plenty of great places to find inspiration and the following list contains just a few ideas to help get you started.

Finding a solid topic is one of the most important steps when writing any type of paper. It can be particularly important when you are writing a psychology research paper or essay. Psychology is such a broad topic, so you want to find a topic that allows you to adequately cover the subject without becoming overwhelmed with information.

I can always tell when a student really cares about the topic they chose; it comes through in the writing. My advice is to choose a topic that genuinely interests you, so you’ll be more motivated to do thorough research.

In some cases, such as in a general psychology class, you might have the option to select any topic from within psychology's broad reach. Other instances, such as in an  abnormal psychology  course, might require you to write your paper on a specific subject such as a psychological disorder.

As you begin your search for a topic for your psychology paper, it is first important to consider the guidelines established by your instructor.

Research Topics Within Specific Branches of Psychology

The key to selecting a good topic for your psychology paper is to select something that is narrow enough to allow you to really focus on the subject, but not so narrow that it is difficult to find sources or information to write about.

One approach is to narrow your focus down to a subject within a specific branch of psychology. For example, you might start by deciding that you want to write a paper on some sort of social psychology topic. Next, you might narrow your focus down to how persuasion can be used to influence behavior .

Other social psychology topics you might consider include:

• Prejudice and discrimination (i.e., homophobia, sexism, racism)
• Social cognition
• Person perception
• Social control and cults
• Persuasion, propaganda, and marketing
• Attraction, romance, and love
• Nonverbal communication
• Prosocial behavior

Psychology Research Topics Involving a Disorder or Type of Therapy

Exploring a psychological disorder or a specific treatment modality can also be a good topic for a psychology paper. Some potential abnormal psychology topics include specific psychological disorders or particular treatment modalities, including:

• Eating disorders
• Borderline personality disorder
• Seasonal affective disorder
• Schizophrenia
• Antisocial personality disorder
• Profile a  type of therapy  (i.e., cognitive-behavioral therapy, group therapy, psychoanalytic therapy)

Topics of Psychology Research Related to Human Cognition

Some of the possible topics you might explore in this area include thinking, language, intelligence, and decision-making. Other ideas might include:

• False memories
• Speech disorders
• Problem-solving

Topics of Psychology Research Related to Human Development

In this area, you might opt to focus on issues pertinent to  early childhood  such as language development, social learning, or childhood attachment or you might instead opt to concentrate on issues that affect older adults such as dementia or Alzheimer's disease.

Some other topics you might consider include:

• Language acquisition
• Media violence and children
• Learning disabilities
• Gender roles
• Child abuse
• Prenatal development
• Parenting styles
• Aspects of the aging process

Do a Critique of Publications Involving Psychology Research Topics

One option is to consider writing a critique paper of a published psychology book or academic journal article. For example, you might write a critical analysis of Sigmund Freud's Interpretation of Dreams or you might evaluate a more recent book such as Philip Zimbardo's  The Lucifer Effect: Understanding How Good People Turn Evil .

Professional and academic journals are also great places to find materials for a critique paper. Browse through the collection at your university library to find titles devoted to the subject that you are most interested in, then look through recent articles until you find one that grabs your attention.

Topics of Psychology Research Related to Famous Experiments

There have been many fascinating and groundbreaking experiments throughout the history of psychology, providing ample material for students looking for an interesting term paper topic. In your paper, you might choose to summarize the experiment, analyze the ethics of the research, or evaluate the implications of the study. Possible experiments that you might consider include:

• The Milgram Obedience Experiment
• The Stanford Prison Experiment
• The Little Albert Experiment
• Pavlov's Conditioning Experiments
• The Asch Conformity Experiment
• Harlow's Rhesus Monkey Experiments

Topics of Psychology Research About Historical Figures

One of the simplest ways to find a great topic is to choose an interesting person in the  history of psychology  and write a paper about them. Your paper might focus on many different elements of the individual's life, such as their biography, professional history, theories, or influence on psychology.

While this type of paper may be historical in nature, there is no need for this assignment to be dry or boring. Psychology is full of fascinating figures rife with intriguing stories and anecdotes. Consider such famous individuals as Sigmund Freud, B.F. Skinner, Harry Harlow, or one of the many other  eminent psychologists .

Psychology Research Topics About a Specific Career

​Another possible topic, depending on the course in which you are enrolled, is to write about specific career paths within the  field of psychology . This type of paper is especially appropriate if you are exploring different subtopics or considering which area interests you the most.

In your paper, you might opt to explore the typical duties of a psychologist, how much people working in these fields typically earn, and the different employment options that are available.

Topics of Psychology Research Involving Case Studies

One potentially interesting idea is to write a  psychology case study  of a particular individual or group of people. In this type of paper, you will provide an in-depth analysis of your subject, including a thorough biography.

Generally, you will also assess the person, often using a major psychological theory such as  Piaget's stages of cognitive development  or  Erikson's eight-stage theory of human development . It is also important to note that your paper doesn't necessarily have to be about someone you know personally.

In fact, many professors encourage students to write case studies on historical figures or fictional characters from books, television programs, or films.

Psychology Research Topics Involving Literature Reviews

Another possibility that would work well for a number of psychology courses is to do a literature review of a specific topic within psychology. A literature review involves finding a variety of sources on a particular subject, then summarizing and reporting on what these sources have to say about the topic.

Literature reviews are generally found in the  introduction  of journal articles and other  psychology papers , but this type of analysis also works well for a full-scale psychology term paper.

Topics of Psychology Research Based on Your Own Study or Experiment

Many psychology courses require students to design an actual psychological study or perform some type of experiment. In some cases, students simply devise the study and then imagine the possible results that might occur. In other situations, you may actually have the opportunity to collect data, analyze your findings, and write up your results.

Finding a topic for your study can be difficult, but there are plenty of great ways to come up with intriguing ideas. Start by considering your own interests as well as subjects you have studied in the past.

Online sources, newspaper articles, books , journal articles, and even your own class textbook are all great places to start searching for topics for your experiments and psychology term papers. Before you begin, learn more about  how to conduct a psychology experiment .

What This Means For You

After looking at this brief list of possible topics for psychology papers, it is easy to see that psychology is a very broad and diverse subject. While this variety makes it possible to find a topic that really catches your interest, it can sometimes make it very difficult for some students to select a good topic.

If you are still stumped by your assignment, ask your instructor for suggestions and consider a few from this list for inspiration.

• Hockenbury, SE & Nolan, SA. Psychology. New York: Worth Publishers; 2014.
• Santrock, JW. A Topical Approach to Lifespan Development. New York: McGraw-Hill Education; 2016.

By Kendra Cherry, MSEd Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

Exploring 200+ Psychology Topics to Research: Unlocking the Depths of the Mind

The world of psychology is as vast as the human mind itself. Delving into the intricate workings of the human psyche can be both fascinating. For students, academics, or anyone with a curious mind, choosing the right psychology topics to research is paramount. In this blog, we’ll navigate through the labyrinth of psychology topics, helping you find your way to a captivating and meaningful research endeavor.

How To Select Psychology Topics To Research?

Table of Contents

• Follow Your Interests: Start with what you love. What aspects of human behavior or the mind fascinate you the most? It’s much easier to research something you’re passionate about.
• Consider Relevance: Think about how your chosen topic fits into your academic or career goals. Does it relate to what you’re studying or the job you want? If it does, great!
• Balance the Scope: Don’t pick a topic that’s too broad or too narrow. Find that sweet spot in the middle. You want a topic that’s focused enough to research effectively but not so narrow that there’s no existing information.
• Explore Different Areas: Research the various branches of psychology, like cognitive, social, clinical, developmental, or biological psychology. See which one resonates with you the most.
• Seek Advice: Talk to your professors, mentors, or peers. They can provide guidance and suggestions based on your interests and goals.

200+ Popular Psychology Topics To Research: Category Wise

40+ cognitive psychology topics.

• The role of working memory in problem-solving.
• Cognitive effects of sleep deprivation.
• Neural basis of attention and focus.
• Influence of language on cognitive development.
• Decision-making biases in economic behavior.
• The psychology of learning and memory.
• The impact of stress on cognitive performance.
• Cognitive decline in aging populations.
• Emotion and memory recall.
• False memories and eyewitness testimony.
• Cognitive processes in creativity.
• Cognitive aspects of decision-making in healthcare.
• The psychology of expertise and skill acquisition.
• Cognitive factors in reading comprehension.
• The role of schemas in information processing.
• Cognitive development in infants.
• Cognitive rehabilitation after brain injury.
• Attention-deficit/hyperactivity disorder (ADHD) and executive functions.
• Neural mechanisms of perception and visual attention.
• The psychology of problem-solving in artificial intelligence.
• Cognitive aspects of mathematical reasoning.
• Neural plasticity and cognitive recovery.
• Cognitive load and its impact on learning.
• Memory consolidation during sleep.
• Attentional disorders and their impact on cognitive functioning.
• The influence of music on cognitive processes.
• Cognitive development in bilingual individuals.
• Cognitive aspects of decision-making in criminal behavior.
• Neural correlates of cognitive control.
• The psychology of cognitive biases in politics.
• Cognitive effects of mindfulness meditation.
• The part working memory plays in academic success.
• Cognitive processes in language acquisition.
• Cognitive factors in problem gambling behavior.
• The psychology of cognitive development in children with autism.
• Cognitive aspects of spatial navigation.
• Memory distortions and the courtroom.
• Neural basis of cognitive dissonance.
• Cognitive aspects of social perception.
• Cognitive rehabilitation in Alzheimer’s disease.

40+ Social Psychology Research Topics

• The impact of social media on self-esteem.
• Groupthink and decision-making.
• Stereotype threat in academic settings.
• Bystander effect in emergencies.
• Cross-cultural perspectives on conformity.
• Online dating and self-presentation.
• The psychology of social influence.
• The role of empathy in prosocial behavior.
• Social identity and intergroup relations.
• Aggression and video game exposure.
• Prejudice and discrimination in modern society.
• The influence of social norms on behavior.
• Attitudes and attitude change.
• Social support and mental health.
• Obedience to authority figures.
• Social comparison and self-concept.
• The psychology of attraction and relationships.
• The bystander intervention model.
• Body image and social media.
• Political polarization and social psychology.
• The psychology of fake news and misinformation.
• Emotional contagion and social interactions.
• Stereotyping in the workplace.
• Consequences of cyberbullying.
• The impact of group dynamics on creativity.
• Gender roles and socialization.
• The role of humor in social interactions.
• Social factors in decision-making and risk-taking.
• Altruism and volunteerism.
• The psychology of leadership and authority.
• Social exclusion and its effects on individuals.
• The relationship between religion and prosocial behavior.
• Social influence in marketing and advertising.
• Online activism and social change.
• The psychology of online communities and forums.
• Attachment styles and adult relationships.
• Social perceptions of beauty and attractiveness.
• Social isolation’s negative consequences on mental health.
• The psychology of public speaking anxiety.
• The role of forgiveness in interpersonal relationships.

40+ Clinical Psychology Research Topics

• Effects of childhood trauma on mental health in adults.
• Efficacy of virtual therapy for treating anxiety disorders.
• Exploring the genetics of schizophrenia.
• Effects of mindfulness meditation on depression.
• Cultural factors in the diagnosis of eating disorders.
• Examining the link between sleep disorders and mood disorders.
• Assessing the effectiveness of group therapy for substance abuse.
• The role of attachment in borderline personality disorder.
• Investigating the stigma surrounding mental illness.
• Treating PTSD in veterans through exposure therapy.
• Neurobiological basis of obsessive-compulsive disorder (OCD).
• Parent-child relationships and their impact on conduct disorder.
• Gender differences in the prevalence of depression.
• Cognitive-behavioral therapy for social anxiety disorder.
• Psychopharmacology and treatment-resistant depression.
• The psychology of self-harm and self-injury.
• Internet addiction and its connection to mental health.
• Assessing the efficacy of art therapy for PTSD.
• Personality disorders and their impact on interpersonal relationships.
• Evaluating the effectiveness of dialectical behavior therapy (DBT) in treating borderline personality disorder.
• Factors contributing to the rise in adolescent depression.
• Exploring the link between childhood abuse and dissociative identity disorder.
• Cross-cultural perspectives on the diagnosis of ADHD.
• The role of serotonin in mood disorders.
• Mindfulness-based stress reduction in chronic pain management.
• Impact of family dynamics on eating disorders in adolescents.
• Examining the long-term effects of child neglect on adult mental health.
• Psychosocial factors in the development of schizophrenia.
• Gender dysphoria and psychological well-being.
• The psychology of resilience in cancer patients.
• Attachment styles and their influence on adult relationships.
• Virtual reality exposure therapy for phobias.
• Exploring the effectiveness of equine therapy for trauma survivors.
• Autism spectrum disorders and early intervention.
• Body image dissatisfaction and its link to eating disorders.
• The psychological impact of chronic illness.
• Cognitive rehabilitation in traumatic brain injury.
• Sleep disorders in children and their impact on academic performance.
• The role of social support in recovery from substance abuse.
• Neuropsychological assessment in Alzheimer’s disease diagnosis.

40+ Developmental Psychology Research Topics

• The impact of parental divorce on child development.
• Adolescents’ self-identity and social media.
• Long-term effects of early childhood attachment on adult relationships.
• Gender identity development in children.
• The influence of birth order on personality development.
• The role of genetics in language development.
• Autism spectrum disorder interventions for toddlers.
• Adolescent peer pressure and substance abuse.
• The impact of bullying on psychological development.
• Sibling rivalry and its long-term effects.
• Parenting styles and their influence on children’s behavior.
• The development of moral reasoning in children.
• Influence of cultural factors on child development.
• Attachment theory and foster care outcomes.
• The impact of technology on cognitive development in children.
• Children’s understanding of death and grief.
• Cognitive development in bilingual children.
• The role of play in early childhood development.
• Attachment disorders and interventions in adopted children.
• The development of emotional intelligence in adolescents.
• The impact of poverty on child development.
• The relationship between nutrition and cognitive development.
• Bullying prevention and intervention programs in schools.
• The role of grandparents in child development.
• Developmental aspects of sibling relationships.
• Child prodigies and their psychological development.
• Gender stereotypes and their influence on children’s aspirations.
• The effects of early education on academic success.
• Cognitive development in children with learning disabilities.
• The impact of divorce on young adults’ romantic relationships.
• Parent-child communication about sex education.
• Adolescents’ body image and its influence on self-esteem.
• Influence of peer relationships on early social development.
• The role of extracurricular activities in adolescent development.
• Long-term outcomes for children in same-sex parent families.
• Cognitive development in children with ADHD.
• The effects of early exposure to screens on cognitive development.
• The role of attachment in adolescent mental health.
• Identity development in multicultural children.

40+ Biological Psychology Research Topics

• The neural basis of addiction and substance abuse.
• The role of genetics in personality traits.
• Effects of sleep deprivation on cognitive function.
• Exploring the gut-brain connection and its impact on mental health.
• Neural mechanisms of stress and its long-term effects.
• The relationship between brain structure and intelligence.
• The impact of exercise on brain health and cognition.
• Neurobiological factors in eating disorders.
• Neural pathways involved in fear and anxiety.
• The influence of hormones on behavior and mood.
• Neuroplasticity and its implications for recovery after brain injuries.
• The biology of memory and amnesia.
• Understanding the neurological basis of schizophrenia.
• The role of neurotransmitters in depression.
• The impact of aging on brain structure and function.
• Neural mechanisms underlying aggression and violence.
• Brain imaging techniques and their applications in research.
• The effects of prenatal exposure to toxins on brain development.
• Neurological aspects of autism spectrum disorders.
• Brain changes associated with post-traumatic stress disorder (PTSD).
• The genetics of Alzheimer’s disease.
• Neurobiology of consciousness and altered states of consciousness.
• The role of the amygdala in emotional processing.
• Neural mechanisms of sexual attraction and orientation.
• The impact of nutrition on brain development and function.
• Brain regions involved in decision-making and impulsivity.
• Neurological factors in Tourette’s syndrome.
• The biology of reward and motivation.
• Neural correlates of empathy and social cognition.
• Genetic predisposition to addiction.
• The influence of hormones on maternal behavior.
• The neurological basis of attention-deficit/hyperactivity disorder (ADHD).
• Adolescent brain development and the effects on behavior.
• The prefrontal cortex’s function in executive tasks.
• Linguistic disorders and language neuroscience.
• Neuroinflammation’s effects on mental health.
• Mechanisms in the brain that affect sensory perception.
• Neurological and genetic influences on bipolar disorder.
• The impact of persistent pain on brain development and function.
• The endocannabinoid system’s function in controlling mood.

Research Methodology for Psychology Topics

Understanding various research methodologies is key to conducting a successful study. Whether you opt for experimental designs, surveys, case studies, or sophisticated data analysis, each method offers unique insights. Choose the methodology that aligns with your research questions and objectives, ensuring a robust and reliable study.

Resources for Psychology Research

In the digital age, a wealth of resources for psychology topics to research is at your fingertips. Utilize academic journals, databases, books, and online courses to enhance your understanding. 

Engage with professional organizations and attend conferences to stay updated with the latest research trends and network with fellow enthusiasts.

Tips for Successful Psychology Topics for Research

• Choose a Fascinating Topic: Select a research topic that genuinely interests you. Your passion and curiosity will drive your motivation and engagement throughout the research process.
• Narrow Your Focus: Refine your research question to ensure it’s specific and manageable. A focused question will lead to more meaningful and in-depth findings.
• Conduct a Thorough Literature Review: Familiarize yourself with existing research in your chosen area. This helps you build on prior knowledge and identify gaps in the literature.
• Hypothesize and Predict: Develop clear hypotheses and predictions for your study. This sets the direction for your research and provides a framework for data collection and analysis.
• Choose the Right Research Method: Select the research method that best suits your research question, whether it’s experiments, surveys, interviews, or case studies.
• Ethical Considerations: Prioritize ethical guidelines in your research, including obtaining informed consent, ensuring confidentiality, and avoiding harm to participants.
• Sample Selection: Carefully choose your sample to make sure it’s representative of the population you’re studying. Consider factors like age, gender, and cultural diversity.
• Data Collection: Collect data systematically and ensure its accuracy and reliability. Use well-established measurement tools when applicable.
• Data Analysis: Employ appropriate statistical techniques to analyze your data. Make use of software like SPSS or R for thorough analysis.
• Interpret Results Objectively: Avoid confirmation bias and interpret your results objectively, even if they don’t align with your initial hypotheses.
• Discuss Limitations: Acknowledge the limitations of your study in your research paper. This demonstrates your awareness of potential weaknesses and strengthens your research’s credibility.
• Contribute to the Field: Highlight the significance of your research and how it contributes to the broader field of psychology. What does it add to existing knowledge?
• Write Clearly and Concisely: Communicate your findings in a clear, concise, and well-structured manner. Use APA or other relevant style guides for formatting.
• Peer Review: Seek feedback from colleagues, mentors, or professors. Peer review can help identify blind spots and improve the quality of your work.
• Stay Organized: Maintain detailed records of your research process, including notes, data, and references. Organization is key to successful research.
• Time Management: Plan your research timeline carefully, allocating sufficient time for each stage, from literature review to data collection and analysis.
• Persevere: Research often involves setbacks and challenges. Stay persistent, adapt when necessary, and remain dedicated to your research goals.
• Publish and Share: Consider presenting your research at conferences and seek opportunities for publication in academic journals . Sharing your findings contributes to the advancement of the field.
• Stay Informed: Keep up with the latest research trends and developments in psychology. Attend conferences and join professional organizations to stay connected with the academic community.
• Collaborate: Don’t hesitate to collaborate with other researchers, as teamwork can lead to valuable insights and more significant research outcomes.

Choosing the psychology topics to research is akin to embarking on an adventure into the depths of the human mind. Each topic holds the potential to unravel mysteries, challenge assumptions, and make a meaningful impact on individuals and society. 

As you venture into this realm, remember that your curiosity and dedication are your greatest assets. Embrace the journey, learn from every step, and let your research contribute to the ever-expanding tapestry of psychological knowledge. Happy researching!

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Psychological Theories

What are psychological theories.

Psychological theories are systematic explanations of human mental processes and behaviors, developed through both empirical research and field observation. These theories provide frameworks for understanding how and why people think, feel, and act the way they do, and guide both academic research and practical applications in areas like therapy, education, marketing, and public policy.

The Basic Idea

Theory, meet practice.

TDL is an applied research consultancy. In our work, we leverage the insights of diverse fields—from psychology and economics to machine learning and behavioral data science—to sculpt targeted solutions to nuanced problems.

If you’ve ever snoozed your alarm and then been late to work or school, you may look back and ask yourself: why did I do that? Maybe your bus driver saw you running for the bus and chose to keep on driving, and you ask yourself: what was going through his mind? Or maybe the day turned out okay, because you came home to your loving partner, and you thought to yourself: why am I so compatible with this person but not others? To begin unpacking these questions and more, we can turn to psychological theories to help us understand ourselves and the people around us.

Psychological theories are systematic frameworks for understanding, predicting, and explaining human behavior and mental processes. These theories include everything from cognitive theories , which focus on mental processes such as perception and memory, to behavioral theories , which examine the relationship between stimuli and responses. Although there are many ways to explain how and why we are the way we are, it is the constant testing and refining of different psychological theories that guides research and helps us to consistently improve our understanding of humans—both within academia and beyond. 

Most Influential Psychological Theories: 

• Psychoanalytic Theory (Sigmund Freud): Focuses on the influence of the unconscious mind on behavior and uses concepts like the id, ego, superego, and psychosexual stages of development.
• Behaviorism (John B. Watson, B.F. Skinner): Emphasizes the study of observable behaviors and the role of environmental stimuli in shaping behavior, including classical conditioning and operant conditioning.
• Cognitive Development Theory (Jean Piaget): Explains how children's thinking evolves as they grow, identifying four stages of cognitive development (sensorimotor, preoperational, concrete operational, and formal operational).
• Humanistic Psychology (Carl Rogers, Abraham Maslow): Emphasizes individual potential, self-actualization, and the importance of personal growth and free will. This also includes Maslow's hierarchy of needs and Rogers' client-centered therapy.
• Social Learning Theory (Albert Bandura): Proposes that people learn behaviors through observation, imitation, and modeling, rather than solely through direct reinforcement and uses reciprocal determinism, where behavior, personal factors, and the environment interact and influence each other.

The world makes much less sense than you think. The coherence comes mostly from the way your mind works. – Daniel Kahneman

Cognition: Mental processes involved in gaining knowledge and comprehension, including thinking, knowing, remembering, judging, and problem-solving.

Psychoanalysis: A therapy developed aimed at exploring the unconscious mind to understand and treat psychological disorders.

Positive Reinforcement : In behaviorism, the process of encouraging or establishing a pattern of behavior by offering a reward when the desired behavior is exhibited.

Montessori Method: An educational approach developed by Dr. Maria Montessori that emphasizes self-directed learning, hands-on activities, creativity, and a love for learning and collaborative play in a child-centered environment.

Herzberg's Motivation Theory: Also known as the two-factor theory, this theory proposes that job satisfaction is influenced by two distinct sets of factors: hygiene factors and motivator factors. Hygiene factors pertain to external conditions such as the workplace environment and salary, while motivator factors are typically intangible elements like receiving recognition or opportunities for personal growth.

As long as there have been humans, there have been questions about why we think and act the way we do. There have likely been countless theories developed throughout time that we have no written record of, such as those developed by native peoples. For many, the known history of psychological theories goes back to ancient philosophical inquiries about the human mind and behavior. Early thinkers like Plato and Aristotle laid the groundwork for understanding the mind's complexities, focusing on issues of perception, memory, and motivation. Hundreds of years later, the 17th century marked a significant shift with the rise of empiricism, championed by philosophers like John Locke who proposed that knowledge is derived from sensory experience. This idea laid the foundation for later psychological theories that emphasize the role of the environment in shaping behavior. 1

The formal birth of psychology as a scientific discipline is often credited to Wilhelm Wundt, who established the first psychology laboratory in Leipzig, Germany, in 1879. Wundt's work marked the beginning of experimental psychology, where he used introspection to explore the structure of the conscious mind. His approach, known as structuralism, aimed to break down mental processes into their most basic components. Around the same time, William James in the United States was developing his own approach called functionalism, which focused on the purpose of consciousness and behavior in helping individuals adapt to their environment. These early schools of thought laid the groundwork for more complex psychological theories. 1

The early 20th century saw the emergence of several influential psychological theories that have shaped the field as we know it today. Sigmund Freud's psychoanalytic theory introduced the idea of the unconscious mind and the role of early childhood experiences in shaping personality (he’s the guy who you usually picture talking to a patient while they lay on a couch, discovering a repressed memory). While Freud's ideas were revolutionary, they were (and still are) controversial, spurring the development of alternative theories. Behaviorism, led by John Watson and later B.F. Skinner, rejected the introspective methods of the past and focused instead on observable behavior, emphasizing the role of environmental stimuli in shaping actions. Behaviorism dominated psychology from the 1920s to the 1950s, particularly in the United States, influencing everything from education to advertising. 1

Toward the mid-20th century emerged a cognitive revolution, as cognitive psychologists began challenging the behaviorist movement by reintroducing the importance of mental processes. Pioneers like Jean Piaget and Noam Chomsky argued that studying internal cognitive processes (like thinking, memory, and language) was crucial for a complete understanding of behavior. This shift led to the development of cognitive psychology, which remains one of the most prominent areas of the field today. Additionally, humanistic psychology, which was considered more of a ‘counter-movement’ to behaviorism, emerged during this time, with figures like Carl Rogers and Abraham Maslow emphasizing personal growth, self-actualization, and the inherent goodness of people. All of these diverse perspectives have contributed to a more comprehensive and multifaceted understanding of human behavior, continuing to influence psychological research and practice today. 2

Plato (c. 427-347 BCE) : Greek philosopher from Athens known for his works on philosophy and the mind, including the theory of forms and the allegory of the cave.

Aristotle (384-322 BCE) : Greek philosopher from Stagira who studied under Plato and is renowned for his contributions to logic, metaphysics, and psychology, particularly his theory of the soul.

John Locke (1632-1704) : English philosopher, often called the "father of liberalism," known for his theory of empiricism, which posits that knowledge is derived from sensory experience.

Wilhelm Wundt (1832-1920) : German psychologist, often regarded as the "father of modern psychology," who established the first psychology laboratory and developed the theory of structuralism.

William James (1842-1910) : American philosopher and psychologist, known as the "father of American psychology," who founded the school of functionalism and authored the first psychology textbook, The Principles of Psychology.

Sigmund Freud (1856-1939) : Austrian neurologist and the founder of psychoanalysis, known for his theories on the unconscious mind, psychosexual development, and defense mechanisms.

John B. Watson (1878-1958) : American psychologist, best known for founding behaviorism, which focuses on the study of observable behavior rather than internal mental processes.

B.F. Skinner (1904-1990) : American psychologist and behaviorist, known for developing the theory of operant conditioning and his work on reinforcement and punishment.

Jean Piaget (1896-1980) : Swiss psychologist, famous for his theory of cognitive development, which outlines how children's thinking evolves through distinct stages.

Noam Chomsky (b. 1928) : American linguist, philosopher, and cognitive scientist, known for his theory of universal grammar and his critique of behaviorism in language acquisition.

Carl Rogers (1902-1987) : American psychologist, one of the founders of humanistic psychology, known for his client-centered therapy and emphasis on self-actualization.

Abraham Maslow (1908-1970) : American psychologist, best known for creating Maslow's hierarchy of needs, a theory that outlines the stages of human motivation from basic needs to self-actualization.

Consequences

The impact of psychological theories extends far beyond academic research; scientifically understanding our own thoughts and behavior has influenced almost all aspects of modern life, shaping practices in education, marketing, public policy, and business.

In the realm of education, psychological theories have revolutionized teaching and learning methodologies. For example, certain developmental theories have provided educators with insights into how children think and learn at different stages. Jean Piaget’s theory of cognitive development suggests that children progress through specific stages of cognitive growth, with each stage characterized by distinct thinking patterns. 3 Understanding these stages allows teachers to adjust their teaching strategies to better match the cognitive capacity of their students. 

Meanwhile, Lev Vygotsky’s concept of the zone of proximal development explains the gap between what a student can learn on their own versus with help. This theory posits that the role of education is to provide children with experiences that are in their proximal development stage, encouraging and advancing individual learning through social interaction. Students can solve problems independently, applying knowledge from conversations with peers and teachers to gradually develop the skills to perform tasks without direct help. 4 Understanding this theory has helped shape the role of teachers in the classroom; sometimes, it’s more about putting students in a situation where they can teach themselves to succeed rather than being explicitly taught. 

For better or worse, psychological theories have also left a huge mark on the field of marketing and consumer behavior. Behaviorism, with its focus on conditioning and reinforcement, has been particularly influential in understanding and shaping consumer habits. Marketers have applied principles of operant conditioning to design reward systems—like loyalty programs or memberships—that encourage repeat purchases by reinforcing desired behaviors. The understanding of cognitive biases, such as the availability heuristic and the framing effect , has also allowed many marketers to craft persuasive messages that influence buyer decision-making. All of these psychological insights have helped businesses increase sales and foster brand loyalty—potentially misleading or even taking advantage of customers. 

Public policy

Public policy is another major area where psychological theories have had significant consequences. Understanding human behavior has helped policymakers create more effective campaigns to improve public health, environmental protection, education systems, and programs that better address social issues such as poverty and crime. The application of small interventions that capitalize on our biases in a nonrestrictive way (often referred to as “ nudging ”), has gained prominence in recent years. This approach, popularized by Richard Thaler and Cass Sunstein, is based on the idea that small changes in the way choices are presented can have a substantial impact on behavior, like automatically enrolling employees in retirement savings plans, with the option to opt-out. A change as simple as this has been shown to dramatically increase participation rates in retirement plans. 

Organizations

If you’re in a traditional workplace, you may have experienced the influence of psychological theories in your office without realizing it. Organizational behavior and human resource management have been hugely shaped by Maslow’s hierarchy of needs and Herzberg’s two-factor theory. Both of these theories have changed how companies understand and manage employee motivation and satisfaction. Maslow’s theory suggests that employees (and all humans) are motivated by a hierarchy of needs, starting with basic physiological needs like food and water and progressing to self-actualization. Thus, companies that recognize and address these needs by providing a safe working environment, opportunities for social interaction, and chances for personal growth, are more likely to foster a motivated and productive workforce (perhaps this is why having free coffee and snacks in the office is so motivating?). Herzberg’s two-factor theory, which distinguishes between hygiene factors (e.g., salary, work conditions) and motivators (e.g., recognition, achievement), has also guided organizations in designing jobs and work environments to maximize employee satisfaction. 

Controversies

Psychological theories, while important to our understanding of human behavior, are theories, not facts. We can still only speculate and make educated guesses as to how and why our brains function the way they do. Many of the theories we’ve previously developed haven’t withstood the test of time, or at least not without serious criticism.

Psychoanalytic Theory

One of the most contentious figures in psychology is Freud, whose psychoanalytic theory has faced huge criticism. Although Freud's focus on the unconscious mind and his theories of psychosexual development were groundbreaking at the time, they were also largely unscientific and overly deterministic. Critics argue that many of Freud’s ideas, such as the Oedipus complex (briefly, that boys are repressing attraction to their moms and jealousy of their fathers’ genitals) and the emphasis on sexual drives, lack empirical support and are difficult if not impossible to test systematically. His theories have also been accused of being culturally biased, reflecting the patriarchal and sexually repressive values of his time, which are largely not applicable (or at least hopefully less so) today. 

Behaviorism 

Behaviorism, another major psychological theory, has also faced significant criticism, particularly for its reductionist approach. Watson and Skinner’s theory focuses exclusively on observable external behaviors and their environmental conditioning, largely ignoring the importance of internal mental processes like emotion. To no surprise, humans have a lot going on under the surface, and not taking this into account can be problematic. That’s because we are much more than machines reacting directly to the environment around us, and internal or unobservable processes (like our preferences, hunger, hormones, and social upbringing) can have dramatic influences on the way we react to stimuli. This critique helped propel the cognitive revolution to take into account the other missing piece of the puzzle: the mind. 

Cognitive Theory

Enter cognitive psychology, which has also been criticized for its heavy reliance on computational models of the mind, which can oversimplify the complexities of human cognition—after all, the brain is not a computer. Since these models usually compare the mind to a computer processing information, they’ve also been accused of neglecting the emotional, social, and cultural factors that influence thought and behavior. Thus, cognitive psychology, just like behaviorism before it, tends to focus on “universal” principles—when, of course, there are huge individual differences among people, places, and cultures. 

Humanistic Psychology

Humanistic psychology emerged as a response to both behaviorism and psychoanalysis to introduce a more optimistic view of human nature—but hasn’t escaped its share of criticisms. While prominent figures like Rogers and Maslow emphasized the potential for personal growth and self-actualization, proposing that people are inherently good and capable of achieving their full potential, many critics argue that this perspective is overly idealistic. Much like Freud’s psychoanalysis, it can be incredibly hard to test humanistic psychology empirically which can make it even harder to find acceptance from the scientific community. Also, due to the focus on the individual’s growth and self-fulfillment, it can be easy to overlook the social and structural factors that limit personal development; essentially, the individual is responsible for their own shortcomings or inadequacies, ignoring systemic issues like poverty, discrimination, and lack of access to education.

Cultural Context

Much of the existing psychology research is on a WEIRD (Western, Educated, Industrialized, Rich, and Democratic) population, which has raised concerns about the generalizability of its findings to non-WEIRD populations. All theories involve some sort of bias, and no population will ever be truly representative. The role of psychological theories in perpetuating or challenging societal norms is a controversial subject because, while the field has contributed to understanding and reducing prejudice, critics argue that some research in social psychology specifically can inadvertently reinforce stereotypes or fail to account for cultural and contextual differences. 

For example, the application of Maslow’s hierarchy of needs discussed earlier posits that individuals prioritize their needs in a specific order, starting with basic physiological needs and moving up through safety, love and belonging, esteem, and self-actualization. This model aligns well with WEIRD cultures, which tend to emphasize individualism and personal achievement since cultural values prioritize personal growth and self-fulfillment. However, in more collectivist cultures, where community, family, and social harmony are often prioritized over individual needs, Maslow’s hierarchy doesn’t fit quite as well. In addition, studies that categorize people into rigid social groups based on race, gender, or socioeconomic status may unintentionally perpetuate the very biases they aim to study. These critiques have led to a growing recognition of the need for more culturally sensitive research and a broader, more inclusive approach to studying behavior.

Behavioral Psychology in Education

Behavioral psychology—particularly the principles of operant conditioning—has been instrumental in shaping modern educational practices. Operant conditioning, a theory developed by Skinner, posits that behavior is influenced by the consequences that follow it. Specifically, reinforcement increases the likelihood of a behavior being repeated, while punishment decreases it. This approach can be applied to classroom management when teachers try to promote positive behavior that leads to academic achievement.

For instance, many schools implement reward systems like tokens or points that use positive reinforcement to encourage good behavior like completing homework on time, participating in class discussions, or staying silent during reading times. Usually, these tokens are traded in for rewards like extra recess time, which can help keep kids motivated. We can also see how punishment systems like detention or extra homework can be used to discourage unwanted or disruptive behavior. All of these systems are designed based on our understanding of different psychological theories, from how we best learn to which tools are appropriate for which ages, and have informed interventions for students with special needs, behavioral disorders, or learning disabilities. 

The Montessori Method is an educational approach that is based on principles from Piaget’s developmental psychology and Vygotsky’s zone of proximal learning principles. Montessori classrooms emphasize self-directed learning, hands-on activities, and collaborative play, giving kids the chance to explore their environment at their own pace and in their own way. Educational materials are designed to support the children’s developmental stages and foster independence, curiosity, and a love of learning: key components of the developmental theory.

Psychological Theories in Therapy 

One of the most direct applications of psychological theories is in the field of clinical psychology, where theories of human behavior and mental processes have informed the development of many therapeutic techniques. For example, many people are familiar with cognitive-behavioral therapy (CBT) , as it’s one of the most widely used therapeutic approaches today. This type of therapy is grounded in cognitive theory by helping individuals identify and change distorted thinking patterns that lead to negative emotions and behaviors. This theory-based approach has proven effective in treating a variety of psychological disorders, including depression, anxiety, and PTSD. 5

Understanding psychological theories is crucial for developing effective therapeutic approaches to provide the foundational knowledge needed to comprehend complex mechanisms underlying mental health issues. These theories can offer structured frameworks that guide therapists in assessing, diagnosing, and treating various psychological conditions and help them address the specific needs of individuals. Since so much of the work is built on tested theory, treatment can be both scientifically grounded and practically effective.

Related TDL Content

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With so much discussion about the impact of psychological theories on education, it’s important to understand some of the biggest challenges in education reform and how they can be improved. 

Financial Planning Education That Puts Humans First

Another important application is looking at how we use psychological theory to shape our financial decisions, and how banks use these same understandings for themselves. 

• Cherry, K. (2023, May 17). A Brief History of Psychology Through the Years . Verywell Mind. https://www.verywellmind.com/a-brief-history-of-psychology-through-the-years-2795245  
• Wikipedia contributors. (2023, August 7). Cognitive revolution . Wikipedia, The Free Encyclopedia. https://en.wikipedia.org/wiki/Cognitive_revolution
• Cherry, K. (2023, July 20). Piaget’s Stages of Cognitive Development . Verywell Mind. https://www.verywellmind.com/piagets-stages-of-cognitive-development-2795457
• McLeod, S. (2023). Zone of Proximal Development . Simply Psychology. https://www.simplypsychology.org/zone-of-proximal-development.html  
• Gaudiano, B. A. (2008). Cognitive-behavioural therapies: achievements and challenges. Evidence-based mental health, 11(1), 5-7.

Case studies

From insight to impact: our success stories, is there a problem we can help with, about the author.

Annika Steele

Annika completed her Masters at the London School of Economics in an interdisciplinary program combining behavioral science, behavioral economics, social psychology, and sustainability. Professionally, she’s applied data-driven insights in project management, consulting, data analytics, and policy proposal. Passionate about the power of psychology to influence an array of social systems, her research has looked at reproductive health, animal welfare, and perfectionism in female distance runners.

We are the leading applied research & innovation consultancy

Our insights are leveraged by the most ambitious organizations.

I was blown away with their application and translation of behavioral science into practice. They took a very complex ecosystem and created a series of interventions using an innovative mix of the latest research and creative client co-creation. I was so impressed at the final product they created, which was hugely comprehensive despite the large scope of the client being of the world's most far-reaching and best known consumer brands. I'm excited to see what we can create together in the future.

Heather McKee

BEHAVIORAL SCIENTIST

GLOBAL COFFEEHOUSE CHAIN PROJECT

OUR CLIENT SUCCESS

Annual revenue increase.

By launching a behavioral science practice at the core of the organization, we helped one of the largest insurers in North America realize $30M increase in annual revenue .

Increase in Monthly Users

By redesigning North America's first national digital platform for mental health, we achieved a 52% lift in monthly users and an 83% improvement on clinical assessment.

Reduction In Design Time

By designing a new process and getting buy-in from the C-Suite team, we helped one of the largest smartphone manufacturers in the world reduce software design time by 75% .

Reduction in Client Drop-Off

By implementing targeted nudges based on proactive interventions, we reduced drop-off rates for 450,000 clients belonging to USA's oldest debt consolidation organizations by 46%

The COM-B Model for Behavior Change

The Transtheoretical Model (TTM)

Randomized Controlled Trial

Qualitative Research

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