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The authors examined the potentially separable contributions of 2 elements of intergroup cooperation, interaction and common fate, and the processes through which they can operate. The manipulation of interaction reduced bias in evaluative ratings, which supports the idea that these components are separable, whereas the manipulation of common fate when the groups were interacting was associated with lower bias in nonverbal facial reactions in response to contributions by in-group and out-group members. Whereas interaction activated several processes that can lead to reduced bias, including decategorization, consistent with the common in-group identity model (S. L. Gaertner, J. F. Dovidio, P. A. Anastasio, B. A. Bachman, & M. C. Rust, 1993) as well as M. Hewstone and R. J. Brown's (1986) group differentiation model, the primary set of mediators involved participants' representations of the memberships as 2 subgroups within a superordinate entity.

Two studies examined whether developing a common ingroup identity among Blacks and Whites can improve Whites’ interracial evaluations. In Study 1, White participants interacted with a Black or White confederate under conditions designed to produce cognitive representations as fellow group members or as separate individuals. Consistent with the Common Ingroup Identity Model, Whites evaluated Blacks more favorably when they interacted with them as members of the same group than as separate individuals. Study 2, conducted as fans entered a football stadium, revealed that Whites complied more frequently with a Black interviewer’s request to interview them when they shared common university affiliation, relative to when the Black interviewer was affiliated with the opposing team.

This survey study involving 1,357 students attending a multi-cultural high school explored how thefeatures identified by the contact hypothesis reduce intergroup bias. Specifically, the study examined predictions derived from the common ingroup identity model that equal status, cooperative interdependence, interaction and egalitarian norms reduce bias, in part, because they alter cognitive representations of the student body from different groups to a more inclusive ingroup. The survey measured students'impressions of thefeatures of contact at school, their representations of the student body (e.g., as one group or different groups), and bias in their affective reactions and overall attitudinal favorability toward groups at school. In general, reductions in bias were predicted by stronger common ingroup representations, weaker representations of two groups, and ethnic/racial identities that included a superordinate American identity. Furthermore, as predicted, cognitive representations (e.g., as one group) mediated the relation between contact and reductions in bias. The findings were integrated into a more complex model in which intergroup affective reactions are conceived to be a major determinant of overall attitudinal favorability.