Heightened Arousal Distraction Social Loafing - When performing as a group, people tend to put forth less effort when their input cannot be identified. Individualistic societies loaf more than collectivistic societies. Gaining New Information Movement toward a group norm Groupthink - The tendency for an isolated, highly cohesive, homogenous group with an opinionated leader to make poor decisions in times of high stress. Compliance - going along with the request of another in order to avoid punishment or seek reward. Victims are more likely to get help when they are similar to the bystander, the bystander is in a good mood, and the bystander is empathetic or afraid of appearing unsympathetic.
Stereotypes influence our attention, recall, and judgments of other people.
Zimbardo's Women in Hoods study and the Stanford Prison study.