Tested conformity by showing participants two large white cards at a time. On one card there was a standard line, on the other there were three comparison lines. One of the three were the same length as the standard line and the other two were clearly different. Participants were asked which of the three matched the standard line.
- 123 American male undergraduates.
- 1951, 1955
Each participant was tested in a group of six to eight confederates (participant was unaware the others were confederates). They were seated around a table with the participant placed last or second to last. They were all asked to give their answers individually, beginning with the 1st person (confederate).
First few trials confederates gave correct answers but were then instructed to give the same wrong answers. Each participant partook in 18 trials of which 12 were answered incorrectly by the confederates.
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