Social Psychology: what, why, and how. Social cognition. Knowing the self. Presenting the self. Forming and changing attitudes. Relating actions and attitudes. Attraction and close relationships. Altruism: extending the self to others. Aggression: harming and hurting others. Developing and resolving conflict. Prejudice and stereotypes. Social influence. The dynamics of groups. The environment.
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Jacobs et al. (1989) studied this question.