Editing Asch conformity experiments (section)

=== Method ===
[[File:Asch experiment.svg|thumb|270px|One of the pairs of cards used in the experiment. The card on the left has the reference line and the one on the right shows the three comparison lines.]]

Groups of eight male college students participated in a simple "perceptual" task. In reality, all but one of the participants were actors, and the true focus of the study was about how the remaining participant would react to the actors' behavior.

The actors knew the true aim of the experiment, but were introduced to the subject as other participants. Each student viewed a card with a line on it, followed by another with three lines labeled ''A'', ''B'', and ''C'' (see accompanying figure). One of these lines was identical in length to that on the first card, and the other two lines were clearly longer or shorter (i.e., a near-100% rate of correct responding was expected). Each participant was then asked to say aloud which line matched the length of that on the first card. Before the experiment, all actors were given detailed instructions on how they should respond to each trial (card presentation). They would always unanimously nominate one comparator, but on certain trials they would give the correct response and on others, an incorrect response. The group was seated such that the real participant always responded last.

Subjects completed 18 trials. On the first two trials, both the subject and the actors gave the obvious, correct answer. On the third trial, the actors would all give the same wrong answer. This wrong-responding recurred on 11 of the remaining 15 trials. It was subjects' behavior on these 12 "critical trials" (the 3rd trial + the 11 trials where the actors gave the same wrong answer) that formed the aim of the study: to test how many subjects would change their answer to conform to those of the 7 actors, despite it being wrong. Subjects were interviewed after the study including being debriefed about the true purpose of the study. These post-test interviews shed valuable light on the {{nowrap|study{{px2}}{{mdash}}{{px2}}}}both because they revealed subjects often were "just going along", and because they revealed considerable [[individual differences]] to Asch. Additional trials with slightly altered conditions were also run,<ref name="Asch1951" /> including having a single actor also give the correct answer.

Asch's experiment also had a condition in which participants were tested alone with only the experimenter in the room. In total, there were 50 subjects in the experimental condition and 37 in the control condition.