... ad he placed in a local Palo Alto newspaper attracted 75 potential participants, of which he chose 21(314). To insure the "prisoners" and "guards" were medically, physically, and mentally fit, the applicants were tested and interviewed. Zimbardo stresses the fact that the applicants were randomly split into 2 groups: prisoners and guards (314). Zimbardo himself was the prison warden. The prison was without windows or clocks, and was even equipped with a solitary confinement cell called the "hole"(315). One of the many sadistic endeavors that took place in the prison was called the "count"(315). The count was used to make sure the prisoners could recite their ID numbers and the rules of the prison. At first, the count was performed 3 times a day for 10 minutes each time. But as the study progressed, the guards increased the duration of the count to "seemingly interminable several hours"(315). Guards became ...

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