B. Du Bois, the first African American to earn a doctoral degree from Harvard University. Du Bois wrote, "[t]he problem of the twentieth century is the problem of the color line." Wellman (1993) defines racism as "culturally sanctioned beliefs, which, regardless of intentions involved, defend the advantages whites have because of the subordinated position of racial minorities". In both sociology and economics, the outcomes of racist actions are often measured by the inequality in income, wealth, net worth, and access to other cultural resources (such as education), between racial groups. 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. Some sociologists also argue that, particularly in the West, where racism is often negatively sanctioned in society, racism has changed from being a blatant to a more covert expression of racial prejudice. The "newer" (more hidden and less easily detectable) forms of racism—which can be considered embedded in social processes and structures—are more difficult to explore and challenge. It has been suggested that, while in many countries overt or explicit racism has become increasingly taboo, even among those who display egalitarian explicit attitudes, an implicit or aversive racism is still maintained subconsciously. This process has been studied extensively in social psychology as implicit associations and implicit attitudes, a component of implicit cognition. Implicit attitudes are evaluations that occur without conscious awareness towards an attitude object or the self. These evaluations are generally either favorable or unfavorable. They come about from various influences in the individual experience. Implicit attitudes are not consciously identified (or they are inaccurately identified) traces of past experience that mediate favorable or unfavorable feelings, thoughts, or actions towards social objects. These feelings, thoughts, or actions have an influence on behavior of which the