Diffusion of responsibility.-group polarization is the phenomenon that, given time together to discuss something, groups of like-minded individuals will often come to hold more extreme ideas than those with which they entered the group. one possible reason for this phenomenon is that in the group, the responsibility for the extreme decision seems to be divided among the groups members. outgroup bias is the prejudice people feel against members of other groups. selffulfilling prophecy is the idea that one persons expectations about another person can influence the second persons behavior. self-serving bias is thetendency to take greater responsibility for successful outcomes than unsuccessful ones. the fundamental attribution error is the tendency to underestimate the influence of situational factors on other peoples behavior.