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Every aspect of the prisoners' behavior fell under the total and arbitrary control of the guards. Even going to the toilet became a privilege which a guard could grant or deny at his whim. Indeed, after the nightly 10:00 P.M. lights out "lock-up," prisoners were often forced to urinate or defecate in a bucket that was left in their cell. On occasion the guards would not allow prisoners to empty these buckets, and soon the prison began to smell of urine and feces -- further adding to the degrading quality of the environment.

The guards were especially tough on the ringleader of the rebellion, Prisoner #5401. He was a heavy smoker, and they controlled him by regulating his opportunity to smoke. We later learned, while censoring the prisoners' mail, that he was a self-styled radical activist. He had volunteered in order to "expose" our study, which he mistakenly thought was an establishment tool to find ways to control student radicals. In fact, he had planned to sell the story to an underground newspaper when the experiment was over! However, even he fell so completely into the role of prisoner that he was proud to be elected leader of the Stanford County Jail Grievance Committee, as revealed in a letter to his girlfriend.


Most prisoners believed that the subjects selected to be guards were chosen because they were bigger than those who were made prisoners, but actually, there was no difference in the average height of the two groups. What do you think caused this misperception?


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