best social psychology experiments

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.

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.

11 Most Influential Psychological Experiments in History

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.

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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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9 of the Most Influential Social Psychology Experiments in History

For those interested in understanding how social interactions can shape behavior and mental processes, this article dives deep into some of the most influential social psychology experiments in history. Covering everything from the perpetrator-victim dynamic prevalent in Stanley Milgram’s infamous obedience experiment to the false consensus effect just a few years later, these social psychology experiments provide invaluable insights into the human psyche.

Through carefully conducted studies such as Lee Ross’ Diffusion of Responsibility Experiment and Edward Thorndike’s Halo Effect Experiment, as well as famous experiments such as Albert Bandura’s Bobo Doll Experiment, we are able to better comprehend why people act the way they do in certain situations. Come explore these incredible, influential experiments that have left their mark on social psychology and the world!

To learn more about what is social psychology check out our article.

The Stanford Prison Experiment, 1971

1.1. overview.

The Stanford Prison Experiment was a widely known and controversial social psychology experiment conducted in 1971 at Stanford University by Professor Philip Zimbardo to investigate how ordinary, healthy people would react to being made prisoners or prison guards. It has since become a classic social psychology experiment and is still studied today. However, the experiment has come under considerable criticism in recent years due to ethical issues.

1.2. Results

Twenty-four male college students were recruited for the experiment, which involved them playing the role of either prisoner or guard. Each group was then allotted 8-hour shifts and treated as if they were in a real prison situation. The prisoners were kept in the makeshift prison set up in the basement of the Psychology Department, where the guards were responsible for ensuring the inmates followed prison regulations. The participants were screened to guarantee they had no mental or physical problems that may have influenced their behavior.

The experiment concluded that it is possible to change the behavior of individuals when placed in groups, even when they are not aware they are being observed. The study showed how quickly people will conform to expected social roles and how easily ‘ordinary’ people can be transformed from ‘good’ to ‘evil.’ Both the prisoners and guards revealed stereotypical characteristics associated with correctional officers; the prisoners became emotionally unstable and submissive, whilst the guards became hostile and authoritative.

1.3. Criticisms

Philip Zimbardo’s experiment, the Stanford Prison Experiment, is like a dark mirror reflecting our society’s innermost fears. In 1971, Zimbardo conducted an experiment in which college students were randomly assigned to be either prisoners or guards in a simulated prison environment. The results of this study showed that people could quickly adapt to roles and lose their sense of morality when placed in certain situations.

The impact of the Stanford Prison Experiment has been far-reaching; it has been used as evidence for why prisons are so dangerous and how they can lead to psychological damage among inmates. It also serves as a reminder that power dynamics between individuals can have serious consequences if not monitored closely.

Critics have argued that the ethical practices employed by Zimbardo during his experiment were questionable at best, with some participants experiencing extreme distress due to their role-playing experience. Despite these criticisms, many believe that the experiment still provides valuable insight into human behavior and psychology today. Personifying its lessons, we could say that the Stanford Prison Experiment speaks volumes about how easily our moral compass can become distorted when faced with authority figures or oppressive environments.

The Asch Conformity Experiment, 1951

2.1. overview.

The Asch Conformity Experiment, also known as the “Asch Line Study,” was a series of experiments conducted by psychologist Solomon Asch in 1951 to test how people tend to conform to social pressures. The study was composed of two groups: one consisting of actual participants (the control group) and the other including actors (the confederates).

During the experiment, the participants were asked to view a line on one board and then match it to one of three lines on another board with their own judgment. Initially, the group was given correct answers; however, after a few attempts, the actors began to give wrong answers intentionally to observe how the participant would respond.

2.2. Results

The results showed that 75% of the participants conformed to the incorrect majority opinion given by the confederate group—even when it obviously contradicted their own senses. In addition, the control group with only real subjects produced a much lower rate of conformity, with less than 1% ever selecting the incorrect answer. This demonstrated that it was not the difficulty of the task but rather the presence of an influential social group that caused the majority of participants to deny their own thoughts in order to fit in with the others.

2.3. Criticisms

Critics have argued that the experiment was not diverse enough since it mainly used college-aged men as its sample population. Additionally, because the experiment did not include females, it has been suggested that the results of the cave experiment cannot be generalized to all genders.

Furthermore, critics have argued that the experimental design lacked a true measure of real-life social pressure since the actors and real participants knew the situation was artificial. Despite these criticisms, the Asch experiment remains one of the most important social psychology studies in history, and its core message about the power of conformity to influence opinions and behavior continues to be studied and discussed today.

We tackled the topic of conformity in our article about social influence .

The Bobo Doll Experiment, 1961

3.1. overview.

The Bobo Doll experiment was a series of experiments conducted by psychologist Albert Bandura between 1961 and 1963 at Stanford University, aimed at studying the extent to which human behavior is based on social imitation rather than inherited genetic factors.

Three groups of 24 participants each, aged from 3 to 6 years old, were chosen for the experiment – a control group (with no interaction with any adults), an aggressive group (observing an adult behaving aggressively towards the doll), and a passive group (observing a more passive adult playing with the doll). The results of the studies were a strong indication that children were strongly influenced by watching other people’s behavior and imitated it afterward in their own behavior.

3.2. Results

The study found that the children in the aggressive and passive groups were significantly more likely to behave aggressively towards the bobo doll than those in the control group, even though the latter had not been exposed to any type of model behavior. When it came to gender differences, boys showed more aggressive behavior when exposed to the aggressive behavior of male models, while girls showed similar findings, albeit less drastic.

Moreover, the study also contained a memory test during which wrong answers were punished with electric shocks; here, it appeared as if the individual completing the test was affected by the electric shocks, suggesting that authority figures can greatly influence behavior, even if not intentionally. Finally, the study also showed that when urged to continue with the experience even after protests from the individual receiving electric shocks, they complied with the requests, highlighting the power of authority within social situations.

3.3. Criticisms

Although the experiment raised widely accepted as evidence for the hypothesis that individuals learn behavior by observing others, the Bobo Doll experiment has been criticized in recent years. One key point of criticism is that Bandura’s research neglected to look at positive modeling – for example, modeling of altruism or helpful behavior, instead focusing solely on aggression.

Additionally, some have argued that, due to its relatively small sample size and laboratory-based approach, the study failed to take into account real-life influences, such as environmental variables, which would have provided additional context. Despite these criticisms, the Bobo Doll experiment remains one of the most famous studies in psychology, providing significant evidence for the importance of social learning theory in understanding human behavior.

The Milgram Experiment, 1963

4.1. overview.

The Milgram Experiment was a famous social psychology experiment and experiment conducted by Stanley Milgram in the 1960s. Its aim was to test people’s obedience to authority. The study examined how far people would go when an authority figure instructed them to perform acts that conflicted with their morals.

Specifically, it sought to find out if non-Nazi populations, such as those from the United States, would follow orders to harm other persons. One of the motivations for this investigation was the results of World War II, during which Nazi leader Adolf Eichmann was able to use “I was only following orders” as a legal defense at the Nuremberg trials.

4.2. Results

The experiment was conducted at Yale University in 1961 and included unsuspecting participants who were told that the study was about memory. Participants believed they were participating in a study where they would be required to act as teachers while an unsuspecting confederate (learned) was on the other side of the wall. Their task was to ask questions to the learner, and if they received a wrong answer, press a button administering shock, ranging from 15 volts to 450 volts.

The results showed that despite protests and cries from the learner, 63% of the participants continued pressing the switch. Milgram’s experiment revealed that human beings are conditioned to obey authority figures, even when going against their natural moral code.

4.3. Criticisms

Despite its significance, the Milgram Experiment has been heavily criticized over the years, and some have argued that the study violated ethical standards. The argument is that causing psychological and emotional distress to unwitting volunteers is wrong. Other critics have argued that the role reversals or changes in lab settings would yield different outcomes and should have been considered.

In response to these criticisms, some scientists have suggested controversial experiments by reducing the voltage administered to the learner or conducting newer versions of the experiment in naturalistic settings. In addition, the way modern studies measure obedience is greatly different – contemporary research focuses on motives and reactions participants have after the experiment. These proposed changes would enable researchers to look into extraneous factors influencing obedience versus harm caused to participants.

The Halo Effect Experiment, 1977

5.1. overview.

The halo effect is commonly defined as the phenomenon in which a positive evaluation of one trait extends to an overall perception of an individual. This cognitive bias has been observed by social psychologists for over a century, beginning with psychologist Edward Thorndike’s studies regarding commanding officers in the military.

The halo effect is also known as the “what is beautiful is good” principle or the “physical attractiveness stereotype.” This phenomenon has had a lasting impact on our evaluation and judgment of others. Additionally, the term “halo effect” was named after its likeness to that of the halo painted above the heads of saints and holy figures in religious art, generally regarded as symbols of moral goodness.

To investigate this phenomenon further, Nisbett and Wilson conducted an experiment in 1977 at the University of Michigan. As research participants, they recruited college students who were asked to watch a pre-recorded psychology instructor tape with two different attitudes—one likable and another unlikable. After watching the videotapes, they filled in a questionnaire that asked them to rate the lecturer’s physical appearance, mannerisms, and accent on an 8-point scale ranging from “like extremely” to “dislike extremely.”

Nisbett and Wilson’s study showed that despite the lecturers having the same mannerisms and accents, the respondents rated the lecturer more favorably if their attitude projected a likable demeanor. Moreover, Nisbett and Wilson discovered that people are unaware when the halo effect phenomenon occurs; they inferred that the respondents relied on their initial impression of the lecturer without being aware that it influenced their subsequent assessment. In total, 278 college students participated in the study.

5.2. Results

The results of this study showed that the ratings of the lecturer responded differently depending on his behavior—those who saw him adopt a likable demeanor in the video gave him higher ratings than those who saw him act in an unlikable manner. Furthermore, those who rated the lecturer highly were more likely to believe that he was intelligent, hardworking, kind, and humorous. This suggests that the halo effect can lead people to make inaccurate assumptions about someone based solely on their appearance or behavior.

Moreover, an updated study on the halo effect also suggests that a negative assessment of certain traits can similarly affect subsequent perceptions. For instance, if someone didn’t like the instructor’s physical appearance, they are more likely to rate him as unintelligent and lazy. This provides evidence that negative feelings about one characteristic can extend to an individual’s other features.

5.3. Criticisms

Despite its analytical contributions to the field, some scholars have questioned Nisbett and Wilson’s use of college students as the research participants in the study due to their limited exposure to the concept at hand. Additionally, since the focus of this experiment utilized only pre-recorded videos, there is also criticism of the limitation in the accuracy of facial expressions and vocal intonations. However, this study does provide evidence that people may rely on initial impressions when making assessments, resulting in cognitive bias and inaccurate judgments.

The False Consensus Effect Experiment, 1974

6.1. overview.

The False Consensus Effect Experiment was conducted in 1974 by Professor Lee Ross, then at Stanford University. The experiment focused on how people can form a “false consensus” about the beliefs and preferences of others. Specifically, it asked participants to read situations with two alternative responses and predict which one other people would choose. In the study, most subjects overestimated the likelihood that others would do the same thing as them, even when the situation was hypothetical and there was no real data to indicate what choice the majority of people might make. Furthermore, researchers found that the anticipation of a false consensus could lead people to display negative predictions about the personalities of those who did not share their choice.

6.2. Results

The results of Lee Ross’s experiment demonstrated the false consensus bias – the tendency to overestimate the extent to which others agree with one’s own beliefs and behaviors. He and his colleagues also conducted experiments in the late 1970s to demonstrate how this bias operates in estimating other people’s behaviors and causes. For example, participants chose a resolution to an imagined conflict, then estimated how many others would choose the same.

In another experiment, students were asked to carry a sign that read “eat at joe’s” to measure how many other people agreed with the sign. Those who agreed believed the majority of people would also agree; those who refused believed the majority would refuse. This experiment showed the false consensus effect – we tend to believe the majority of people agree with us and act the same way.

6.3. Criticisms

The false consensus effect is like a mirage in the desert, appearing to be something it’s not. It occurs when people overestimate how much other people agree with them. This bias can lead to an inaccurate perception of reality and cause individuals to make decisions based on false assumptions. The false consensus effect is most likely to occur when someone has strong beliefs or opinions about a particular topic and assumes that others share their views.

The Chameleon Effect Experiment, 1990

7.1. overview.

The Chameleon Effect is a phenomenon of unintentional mirroring, which was observed and studied for the first time in 1939 at the University of Iowa by Dr. Wendell Johnson. It involves someone mimicking another’s body posture, hand gestures, or even speaking accents without realizing it. In the 1990s, researchers Tanya Chartrand and John Bargh conducted follow-up experiments to further study this effect, which would be known as the “Chameleon Effect.”

7.2. Results

During their experiment, Chartrand and Bargh secretly mimicked the actions and behaviors of some test subjects during their conversations and monitored the responses. Those that were mimicked found the researchers more likable compared to those not mimicked. The results point to how people often subconsciously respond to others even if they weren’t consciously aware of the imitating behavior.

7.3. Criticisms

Despite being a popular explanation for why people tend to mirror each other’s behavior, the Chameleon Effect has been criticized by some. These criticisms mostly come from the idea that the phenomenon could potentially involve manipulation as well as desensitizing people to be more vulnerable to conformity and impressions. Additionally, some suggest there may be other reasons why people might mirror each other other than the Chameleon Effect itself, such as insecurity or politeness.

The Diffusion of Responsibility Experiment, 1968

8.1. overview.

The diffusion of responsibility experiment, conducted in 1968 at Stanford University, is an iconic social psychology experiment. It is studied to understand the bystander effect, a phenomenon in which people are more reluctant to express helpfulness or give aid if other bystanders are present.

Stanley Milgram and John Darley conducted the experiment to analyze how the presence of others could influence helping behaviors in kids. The study was also connected to concepts from Lev Vygotsky’s theory referring to emotional role-taking and group cohesiveness when observing the behavior of other members in a particular situation.

In the study, 600 children between the ages of four to six were tested. Each child was presented with one marshmallow, and they were promised to receive a second one if it still remained on the table after 15 minutes.

The results showed that only one-third of the children had delayed their gratification long enough to obtain the second marshmallow. Follow-up studies demonstrated that those children who managed to delay gratification and obtain the second marshmallow had higher SAT scores and were found to be more competent than their peers who could not wait and ate the marshmallow immediately.

8.2. Results

The results of the diffusion of responsibility experiment in 1968 proved to be true to an extent. Its findings added significantly to defining the bystander effect and the effects of the presence of other people, which may inhibit helpers’ reactions to those in need. The research showed that the number of bystanders could have a profound effect on one’s decision on whether to act or to remain inactive. This study takes into account the psychological phenomenon known as diffusion of responsibility which partially explains this inhibition of helping behavior.

8.3. Criticisms

Although the diffusion of responsibility experiment has contributed greatly to our understanding of the bystander effect, there is some criticism surrounding the validity and applicability of the experiment change in the setting in which it was conducted. Namely, there is some concern around the age of the participants, as well as the amount of time provided for the test, both of which may have had an influence on the outcome. In addition, since the experiment was conducted in 1972, there have been numerous changes to society and culture that may not have been taken into account by the authors at the time, leaving some questions as to its usefulness in current situations.

The Cognitive Dissonance Experiment, 1957

Leon Festinger’s Cognitive Dissonance Experiment of 1957 addresses the mental discomfort experienced when trying to hold two conflicting beliefs. The experiment sought to identify how this dissonance is resolved by people and to gain further insight into our thoughts and behaviors.

Stanley Schachter and Jerome E. Singer conducted the experiment with the intention of testing the cognitive theory of emotional arousal. They injected participants with epinephrine, a hormone that can produce side effects– both physical and psychological – such as increased heart rate, faster breathing, and an elevation in blood pressure.

The study featured a confederate who acted either in one of two ways: they were either pleasant or unpleasant. As knowledge of the injection’s side effects became aware to the participants, their emotions shifted accordingly. This revealed that dissonance leads to emotional arousal in individuals, leading them to act in agreement with emotion-triggering cognition.

In light of its results, critics have since made a note of the implausibility of Schachter and Singer’s study, claiming that it does little to address the complexities of the cognitive dissonance theory. By comparison, Leon Festinger’s cognitive dissonance experiment assumes that everyone holds many different cognitions about the world. It then examines what happens when those cognitions do not fit together adequately. Discrepancies are accepted if an event or occurrence makes sense; if not, these discrepancies lead to a state of tension or dissonance.

Interested readers may refer to festive ger’s 1959 article, “Cognitive Dissonance,” for a more in-depth exploration of the experiment’s results and implications. The study remains a classic social psychology experiment, illustrating how we reconcile the conflicts created by existing contradictory beliefs.

The 10 most influential social psychology experiments in history can all be summarized by their contribution to the development of our understanding of human behavior. From Milgram’s famous study revealing our willingness to obey authority figures, to Bandura’s Bobo Doll Experiment establishing the power of aggression and imitation, to Nisbett and Wilson’s Halo Effect Experiment controlling biases towards physical attractiveness, these studies provide insights into the power of group dynamics, social pressures, and cognitive bias that continue to inform and impact modern society today.

Learning about these classic social psychology experiments also encourages us to question our assumptions, explore alternative perspectives, and strive for greater understanding and acceptance. Whether by examining the limitations of data collection or the ethical implications of research methods, these landmark studies have built our knowledge base and served as a reminder of the importance of respect and empathy.

In conclusion, the 10 most influential social psychology experiments listed reflect an inspiring effort to better understand human behavior and engage in much-needed conversations around this fascinating field.

Frequently Asked Questions

What were the initial experiments in social psychology.

Norman Triplett’s 1898 experiment is credited with being the first social psychology experiment. He examined the effects of competition on a simple task – winding hempen string – and found that people performed better when in the presence of others than when alone. His findings ushered in an exciting new field of research into how people are both influenced by, and affect, the social world around them.

Why are experiments are used in social psychology?

Experiments provide valuable insight into human behavior and allow for cause and effect relationships to be better understood. They are an essential tool conducting research in social psychology, allowing the researcher to observe how individuals respond in different situational contexts. Experimentation allows us to answer important questions about social behavior, making it an invaluable research method.

What are social psychology topics?

Social psychology explores the fascinating ways that people interact with each other, from understanding why prejudicial behavior occurs to analyzing why some people have a greater degree of influence over human behaviors than others. Social psychology has played a major role in helping us understand human behavior. It has made invaluable contributions through its research on various topics like prejudice and discrimination, gender, culture, social influence, interpersonal relations, group behavior, aggression etc.

What is an example of a social experiment?

An example of a social experiment is Stanley Milgram’s obedience experiment conducted in 1963 which tested human subjects’ willingness to obey orders regardless of the outcomes. This controversial experiment was conducted in order to understand how far people would go to follow orders from authority figures, even if it meant inflicting pain on another person.

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What was the social experiment of the 60s?

The Social Experiment of the 1960s was the Milgram experiment, conducted by Yale University psychologist Stanley Milgram. It tested participants’ willingness to obey authority when asked to do something that conflicted with their own moral values. The experiment yielded powerful insights into human behavior and the power of authority, making it one of the most influential experiments of its time.