The Zimbardo Experiment

On a quiet Sunday morning in August, a Palo Alto, California, police car swept through the town picking up college students as part of a mass arrest for violation of Penal Codes 211, Armed Robbery, and Burglary, a 459 PC. The suspect was picked up at his home, charged, warned of his legal rights, spread-eagled against the police car, searched, and handcuffed -- often as surprised and curious neighbours looked on.

The car arrived at the station, the suspect was brought inside, formally booked, again warned of his Miranda rights, finger printed, and a complete identification was made. The suspect was then taken to a holding cell where he was left blindfolded to ponder his fate and wonder what he had done to get himself into this mess.

Consider the police procedures which make arrestees feel confused, fearful, and dehumanized. Note that this policeman is wearing sunglasses just like those we had our "guards" wear and as did the head of the National Guards at Attica Prison during its bloody 1971 riot!

What suspects had done was to answer a local newspaper ad calling for volunteers in a study of the psychological effects of prison life. We wanted to see what the psychological effects were of becoming a prisoner or prison guard. To do this, we decided to set up a simulated prison and then carefully note the effects of this institution on the behavior of all those within its walls.
More than 70 applicants answered our ad and were given diagnostic interviews and personality tests to eliminate candidates with psychological problems, medical disabilities, or a history of crime or drug abuse. Ultimately, we were left with a sample of 24 college students from the U.S. and Canada who happened to be in the Stanford area and wanted to earn $15/day by participating in a study. On all dimensions that we were able to test or observe, they reacted normally.
Our study of prison life began, then, with an average group of healthy, intelligent, middle-class males. These boys

Bibliography: • Zimbardo, P. G. (2007). The Lucifer Effect: Understanding how good people turn evil. New York: Random House. [See also LuciferEffect.com] • Schwartz, J. (May 6, 2004). Simulated prison in '71 showed a fine line between 'normal ' and 'monster. ' New York Times, p. A20. • Zimbardo, P. G. (2004). A situationist perspective on the psychology of evil: Understanding how good people are transformed into perpetrators (pp. 21-50). In A. G. Miller (Ed.), The social psychology of good and evil. New York: Guilford Press. • Zimbardo, P. G., Maslach, C., & Haney, C. (2000). Reflections on the Stanford Prison Experiment: Genesis, transformations, consequences. In T. Blass (Ed.), Obedience to authority: Current Perspectives on the Milgram paradigm (pp.193-237). Mahwah, N.J.: Erlbaum. • Haney, C., & Zimbardo, P. G. (1998). The past and future of U.S. prison policy: Twenty-five years after the Stanford Prison Experiment. American Psychologist, 53, 709-727. • Zimbardo, P. G., Haney, C., Banks, W. C., & Jaffe, D. (1973, April 8). The mind is a formidable jailer: A Pirandellian prison. The New York Times Magazine, Section 6, 36, ff. • Haney, C., Banks, W. C., & Zimbardo, P. G. (1973). Interpersonal dynamics in a simulated prison. International Journal of Criminology and Penology, 1, 69-97. • Zimbardo, P. G. (1971). The power and pathology of imprisonment. Congressional Record. (Serial No. 15, October 25, 1971). Hearings before Subcommittee No. 3, of the Committee on the Judiciary, House of Representatives, 92nd Congress, First Session on Corrections, Part II, Prisons, Prison Reform and Prisoners ' Rights: California. Washington, DC: U.S. Government Printing Office.