in 1935 by Sherif who used a
             visual illusion, known as the auto-kinetic effect. Sherif told his subjects that a spot of
             light which they were about to see in a darkened room was going to move, and he
             wanted them to say the direction and distance of the movement. In the first
             experimental condition the subjects were tested individually. Some said the distance of
             movement wasn't very far in any directio, others said it was several inches. Sherif
             recorded each subjects response. In the second experimental condition, Sherif gathered
             ...