40 American men volunteered to take part in an experiment in Milgram's lab and they were told that they were in for a memory study. They made the study that the pps were always the teacher and that the confederate who they met in the lab was always the learner. The learner was in a separate room from the teacher, and the teacher and the experimenter who was wearing a grey lab coat were in the same room. The teacher had to ask the learner questions and if they got it wrong they were shocked ranging from 15-450 volts.