key definitions

emotional release.The catharsis view of aggression is that aggressive drive is reduced when one "releases" aggressive energy, either by acting aggressively or by fantasizing aggression.

resolution of a conflict by a neutral third party who studies both sides and imposes a settlement.

the finding that a person is less likely to provide help when there are other bystanders.

After large request the person is more likely to agree with the second request

a "we feeling"; when members of a group are bound together

giving priority to the goals of one's groups, defining one's identity accordingly.

in a relationship between two people, for each to complete what is missing in the other. 

a tendency to search for information that confirms one's preconceptions.

a change in behavior or belief as a result of real or imagined group pressure.

imagining what might have happened, but didn't.

 After someone first turns down a large request The respondent is then more likely to agree to a second, more reasonable request,

a motive (supposedly concerns  all behavior) to increase one's own welfare

putting oneself in another's shoes.

 the outcomes people receive from a relationship are proportional to what they contribute 

concern for how others are evaluating us.

Underestimation of commonality of one's abilities and one's desirable, successful behaviors.

a set of behavior expectations (norms) for males and females.

a strengthening of the members' average tendency, not a split within the group.

the tendency to exaggerate, known as the I-knew-it-all-along phenomenon.

giving priority to one's own goals over group goals 

an  unlearned behavior pattern exhibited by all members of a species.

believe the world is just and that people  get what they deserve and deserve what they get.

When men and women choose those who are a "good match" in attractiveness 

person's desire to fulfill others' expectations, often to gain acceptance.

the buffer zone we like to maintain around our bodies. 

positive, constructive, helpful social behavior

the theory that we like those whose behavior is rewarding to us 

a person's answers to the question "Who am I?".

Behavior in ways designed to create a favorable impression 

which media influence often occurs through opinion leaders, who in turn influence others.