who gave the concept of ingroup and outgroup
Ingroups and outgroups The terminology was made popular by Henri Tajfel and colleagues during his work in formulating social identity theory. The significance of ingroup and outgroup categorization was identified using a method called the minimal group paradigm. Tajfel and colleagues found that people can form self-preferencing ingroups within a matter of minutes and that such groups can form even on the basis of seemingly trivial characteristics, such as preferences for certain paintings.[1][2][3][4][5]
Ethnocentrism Ethnocentrism is judging another culture solely by the values and standards of one's own culture.[1][2] Ethnocentric individuals judge other groups relative to their own ethnic group or culture, especially with concern for language, behavior, customs, and religion. These ethnic distinctions and subdivisions serve to define each ethnicity's unique cultural identity.[3] William G. Summer defined it as "the technical name for the view of things in which one's own group is the center of everything, and all others are scaled and rated with reference to it." He further characterized ethnocentrism as often leading to pride, vanity, beliefs of one's own group's superiority, and contempt of outsiders.[4] This may occur for the differentiation of people between in-groups and out-groups.[5] Two main view points of ethnocentrism are the social sciences and the genetics. In anthropology, cultural relativism is used as an antithesis and an antonym to ethnocentrism.[6] In biology, ethnocentrism is considered a natural condition of mankind.[7]