quality:corruption, stylistic:tone, structural:reformatting
Sherif's experiment (1935)

Muzafer Sherif was interested in knowing how many people would change their opinions to bring them in line with the opinion of a group. In his experiment, participants were placed in a dark room and asked to stare at a small dot of light 15 feet away. They were then asked to estimate the amount it moved. The trick was, there was no movement, it was caused by a visual illusion known as the autokinetic effect. The participants stated estimates ranging from 1–10 inches. On the first day, each person perceived different amounts of movement, but from the second to the fourth day, the same estimate was agreed on and others conformed to it. Over time, the personal estimates converged with the other group members' estimates once discussing their judgments aloud. Sherif suggested this was a simulation for how social norms develop in a society, providing a common frame of reference for people. His findings emphasize that people rely on others to interpret ambiguous stimuli and new situations.

Subsequent experiments were based on more realistic situations. In an eyewitness identification task, participants were shown a suspect individually and then in a lineup of other suspects. They were given one second to identify him, making it a difficult task. One group was told that their input was very important and would be used by the legal community. To the other it was simply a trial. Being more motivated to get the right answer increased the tendency to conform. Those who wanted to be more accurate conformed 51% of the time as opposed to 35% in the other group. Sherif's study provided a framework for subsequent studies of influence such as Solomon Asch's 1955 study.