asked groups of students to participate in a "vision test." In reality, all but one of the participants were confederates of the experimenter, and the study was really about how the remaining students would react to the confederates' behavior.
In the basic paradigm, the participants — the real subjects and the confederates — were all seated in a classroom. They were asked a variety of questions about the lines such as how long is A, compare the length of A to an everyday object, which line was longer than the other, which lines were the same length, etc. The group was told to announce their answers to each question out loud. The confederates always provided their answers before the study participant, and always gave the same answer as each other. They answered a few questions correctly but eventually began providing incorrect responses.In a control group, with no pressure to conform to an erroneous view, only one subject out of 35 ever gave an incorrect answer. hypothesized that the majority of people would not conform to something obviously wrong; however, when surrounded by individuals all voicing an incorrect answer, participants provided incorrect responses on a high proportion of the questions (32%). Seventy-five percent of the participants gave an incorrect answer to at least one question.
Variations of the basic paradigm tested how many confederates were necessary to induce conformity, examining the influence of just 1 confederate and as many as 15 confederates. Results indicate that 1 confederate has virtually no influence and 2 confederates have only a small influence. When 3 or more confederates are present, the tendency to conform is relatively stable.The unanimity of the confederates has also been varied. When the confederates are not unanimous in their judgment, even if only 1 confederate voices a different opinion, participants are much more likely to resist the urge to conform than when the confederates all agree. This finding illuminates the power that even a small dissenting minority can have. Interestingly, this finding holds whether or not the dissenting confederate gives the correct answer. As long as the dissenting confederate gives an answer that is different from the majority, participants are more likely to give the correct answer.One difference between the conformity experiments and the Milgram experiment as carried out by Stanley Milgram (also famous insocial psychology) is that the subjects of these studies attributed their performance to their own misjudgment and "poor eyesight", while those in the Milgram experiment blamed the experimenter in explaining their behavior. Conformity may be much less salient than authority pressure
Solomon Asch's Conformity Experiment