Asch asked students to take part in a visual discrimination task. All but one of the ppts were confederates. The real purpose of the study was to see how the real ppts reacted to the behaviour of the confederates.
Procedure: 123 male US students were tested. Participants were seated round a table and asked to look at three lines of different lengths. They took turns to call out which line was the same length as a 'standard' line, with the real ppts always answering second to last. There was always a fairly obvious solution to this task, on 12 out of the 18 trials the confederates were told to give the same incorrect answer.
Findings: on the 12 critical tasks, the average conformity rate was 33%. One quarter of participants didn't conform at all, half conformed on six or more trials and one in twenty conformed on all the critical trials. When Asch interviewed his ppts afterwards, he discovered that the majority of them had continued to privately trust their own judgements, but changed their public behaviour to avoid disapproval from other members of the group (compliance).
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