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Personality and Social Psychology Bulletin
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Tracking the Timecourse of Social Perception: The Effects of Racial Cues on Event-Related Brain Potentials

Tiffany A. Ito

University of Colorado, tito{at}psych.colorado.edu

Erin Thompson

University of Colorado

John T. Cacioppo

University of Chicago, cacioppo{at}uchicago.edu

Event-related potentials were used to track social perception processes associated with viewing faces of racial ingroup and outgroup members. Activity associated with three distinct processes was detected. First, peaking at approximately 170 ms, faces were distinguished from nonface stimuli. Second, peaking at approximately 250 ms, ingroup members were differentiated from outgroup members, with a larger component suggesting greater attention to ingroup members. This effect may reflect the spontaneous application of a deeper level of processing to ingroup members. Third, peaking at approximately 520 ms, evaluative differentiation of ingroup and outgroup members occurred, with greater ingroup bias displayed by those with higher levels of prejudice on an explicit measure. Together, the results demonstrate the promise of using neural processes to track the presence, timing, and degree of activation of components relevant to social perception, prejudice, and stereotyping.

Key Words: racial prejudice • implicit prejudice • face processing • social neuroscience

Personality and Social Psychology Bulletin, Vol. 30, No. 10, 1267-1280 (2004)
DOI: 10.1177/0146167204264335
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