Aggression physical or verbal behavior intended to hurt someone. Altruism unselfish regard for the welfare of others. Attitude feelings, often influenced by our beliefs, that predispose us to respond in a particular way to objects, people, and events. Attribution Theory the theory that we explain someone's behavior by crediting either the situation or the person's disposition. Bystander Effect the tendency for any given bystander to be less likely to give aid if other bystanders are present. Central Route Persuasion attitude change path in which interested people focus on the arguments and respond with favorable thoughts. Cognitive Dissonance Theory the theory that we act to reduce the discomfort (dissonance) we feel when two