If I'm not mistaken, they were told the point of the experiment was supposed to be about "memory and learning". If a teacher was doing a "commission" as they put it, they aren't really following the purpose of the experiment any longer.

Context is important. Maybe that was told in the first 3 minutes of the briefing, and them came 30 minutes about the shocks. I would not assume the briefing was so thorough.

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