Psychology
Famous Psychology Experiments & Landmark Studies
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Experiment↕ | Lead Researcher↕ | Year↕ | Institution↕ | Known For↕ |
|---|---|---|---|---|
Stanford Prison Experiment | Philip Zimbardo | 1971 | Stanford University | College students randomly assigned as guards or prisoners in a mock prison descended into cruelty within days — had to be stopped after just six days, demonstrated how situational power corrupts, though heavily criticized for methodology and Zimbardo's dual role as researcher and superintendent |
Milgram Obedience Experiment | Stanley Milgram | 1963 | Yale University | 65% of participants administered what they believed were lethal 450-volt shocks to a stranger simply because an authority figure told them to — conducted to understand Nazi obedience, revealed the terrifying ease with which ordinary people follow destructive orders |
Pavlov's Classical Conditioning | Ivan Pavlov | 1897 | Imperial Military Medical Academy, St. Petersburg | Dogs learned to salivate at the sound of a bell after it was repeatedly paired with food — discovered classical conditioning entirely by accident while studying digestion, won the Nobel Prize, 'Pavlovian response' entered everyday language to describe automatic reactions |
The Marshmallow Test | Walter Mischel | 1972 | Stanford University | Four-year-olds given a marshmallow could eat it now or wait 15 minutes for two — those who waited scored higher on SATs and had better life outcomes decades later, though recent replications show socioeconomic factors matter more than willpower |
Little Albert Experiment | John B. Watson | 1920 | Johns Hopkins University | A 9-month-old baby was conditioned to fear a white rat by pairing it with a terrifying loud noise — demonstrated that emotional responses can be learned, the child was never deconditioned, would be profoundly unethical by modern standards, identity of 'Little Albert' debated for decades |
Asch Conformity Experiment | Solomon Asch | 1951 | Swarthmore College | Participants gave obviously wrong answers about line lengths just to conform with a group of confederates — 75% conformed at least once, demonstrated the overwhelming power of social pressure to override our own perceptions, conformity dropped dramatically with just one dissenting ally |
Harlow's Monkey Experiments | Harry Harlow | 1958 | University of Wisconsin–Madison | Infant monkeys separated from mothers preferred a soft cloth surrogate over a wire one that provided food — devastatingly proved that love and comfort matter more than nourishment, revolutionized understanding of attachment, the monkeys suffered lasting psychological damage |
Bobo Doll Experiment | Albert Bandura | 1961 | Stanford University | Children who watched adults punch and kick an inflatable Bobo doll aggressively imitated the violence — established social learning theory, proved children learn aggression through observation, directly influenced debates about violence in media and video games for decades |
Robbers Cave Experiment | Muzafer Sherif | 1954 | University of Oklahoma | Boys at summer camp were split into rival groups that quickly developed intense hostility — only cooperation toward shared goals (superordinate goals) reduced conflict, foundational study of intergroup relations, realistic conflict theory emerged from this experiment |
The Bystander Effect (Kitty Genovese) | John Darley & Bibb Latané | 1968 | Columbia University / NYU | The more people who witness an emergency, the less likely any individual is to help — inspired by the 1964 murder of Kitty Genovese where reportedly 38 witnesses did nothing, diffusion of responsibility means everyone assumes someone else will act |
Cognitive Dissonance ($1/$20 Study) | Leon Festinger | 1959 | Stanford University | People paid only $1 to lie about a boring task convinced themselves it was actually enjoyable, while those paid $20 didn't bother — proved we change our beliefs to match our actions when we lack external justification, the foundation of cognitive dissonance theory |
The Hawthorne Effect | Elton Mayo / Fritz Roethlisberger | 1924 | Western Electric Hawthorne Works | Factory workers' productivity increased regardless of what lighting changes were made — they worked harder simply because they knew they were being observed, 'Hawthorne Effect' now describes any behavior change caused by awareness of being studied |
Learned Helplessness | Martin Seligman | 1967 | University of Pennsylvania | Dogs that could not escape electric shocks eventually stopped trying even when escape became possible — became a foundational model for understanding depression, people who believe they have no control stop attempting to change their circumstances |
The Invisible Gorilla | Daniel Simons & Christopher Chabris | 1999 | Harvard University | Participants counting basketball passes failed to notice a person in a gorilla suit walk through the scene — inattentional blindness demonstrated that we are staggeringly unaware of things outside our focus, the video has been viewed by millions and still fools people |
Blue Eyes / Brown Eyes Exercise | Jane Elliott | 1968 | Riceville, Iowa elementary school | A third-grade teacher divided her class by eye color and told blue-eyed children they were superior — within hours the 'superior' group became cruel and the 'inferior' group's test scores dropped, a searing classroom demonstration of how quickly discrimination takes root |
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