Shocking "prison" study 40 years later: What happened at Stanford?

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It's considered one of the most notorious psychology experiments ever conducted - and for good reason. The "Stanford prison experiment" - conducted in Palo Alto, Calif. 40 years ago - was conceived by Dr. Philip G. Zimbardo as a way to use ordinary college students to explore the often volatile dynamic that exists between prisoners and prison guards - and as a means of encouraging reforms in the way real-life prison guards are trained.

But what started out as make-believe quickly devolved into an all-too-real prison situation. Some student "guards" became sadistic overlords who eagerly abused the "prisoners," many of whom began to see themselves as real prisoners.

Just what happened in the basement of the Stanford psychology department all those years ago? Keep clicking for a glimpse back in time...

Credit: Philip G. Zimbardo, Inc.