In sociology and social psychology, racial identity and the acquisition of that identity, is often used as a variable in racism studies. Racial ideologies and racial identity affect individuals' perception of race and discrimination. Cazenave and Maddern (1999) define racism as "a highly organized system of 'race'-based group privilege that operates at every level of society and is held together by a sophisticated ideology of color/'race' supremacy. Racial centrality (the extent to which a culture recognizes individuals' racial identity) appears to affect the degree of discrimination African American young adults perceive whereas racial ideology may buffer the detrimental emotional effects of that discrimination." Sellers and Shelton (2003) found that a relationship between racial discrimination and emotional distress was moderated by racial ideology and social beliefs.