My main research focus at present deals with categorization of people. We know a great deal from cognitive psychology about how people form and use categories in general, but we know relatively little about whether social categories are treated the same ways cognitively as the categories studied by cognitive psychologists. One line of research concerns the ways social categories are alike and different from natural kind, artifactual, and nominal categories. We are also investigating the major dimensions along which social categories are perceived to differ. For example, some social groups are seen to be more homogenous than others, and people join some groups more or less voluntarily while other group memberships are assigned at birth.
A second line of research deals with perceptions of bias and discrimination. Why do victims of discrimination sometimes not perceive this, and why do others think that decisions about them are fueled by prejudice?