Philip G. Zimbardo, the psychologist behind the controversial 鈥淪tanford Prison Experiment鈥 that was intended to examine the psychological experiences of imprisonment, has died. He was 91.
Stanford University announced Friday that Zimbardo died Oct. 14 at his home in San Francisco. A cause of death was not provided.
In the 1971 prison study, Zimbardo and a team of graduate students recruited college-aged males to spend two weeks in a mock prison in the basement of a building on the Stanford campus.
The study was ended after six days as the students playing guards became psychologically abusive and those playing prisoners became anxious, emotionally depressed and enraged, according to the Stanford statement.
Zimbardo was criticized for taking the role of superintendent 鈥 becoming an active participant in the study and no longer a neutral observer.
鈥淭he outcome of our study was shocking and unexpected,鈥 Zimbardo would later co-write with one of the graduate students who was part of the project.
The experiment is now used in psychology classes to study the psychology of evil and the ethics of psychological research with human subjects, Stanford said.
Zimbardo's research also included persuasion, hypnosis, cults, shyness, time perspective, altruism, and compassion, Stanford said.
Zimbardo is survived by his wife, Christina Maslach Zimbardo, three children and four grandchildren.
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