Chapter twelve: social psychology: social psychology is the scientific study of how a person"s thoughts, feelings, and behavior are influenced by the real, imagined, or implied presence of other people. Impression formation is part of social cognition, or the mental processes that people use to make sense out of the world around them. 12. 8 how are prejudice and discrimination different: prejudice is a negative attitude that a person holds about the members of a particular social group. Discrimination occurs when members of a social group are treated differently because of prejudice toward that group: there are many forms of prejudice, including ageism, sexism, racism, and prejudice toward those who are too fat or too thin. New immigrants are often the scapegoats for the frustration and anger of the in-group: a schoolteacher divided her class into brown-eyed children and blue- eyed children to teach them a lesson about prejudice.