AC Little, LM DeBruine, BC Jones & C Waitt (2008). Category contingent aftereffects for faces of different races, ages and species. Cognition, 106(3): 1537-1547. doi: 10.1016/j.cognition.2007.06.008

Exposure to faces biases perceptions of subsequently viewed faces. Faces similar to those seen previously are judged more normal than they were prior to exposure. Here we show category contingent aftereffects following adaptation to faces differing in eye-spacing (wide versus narrow) for European versus African faces, adult versus infant faces, and human versus monkey faces. Viewing faces of one category with increased eye-spacing and faces of the other category with decreased eye-spacing simultaneously induced opposite aftereffects according to face category. Because aftereffects reflect changes in responses of neural populations that code faces, our results suggest that distinct neural populations code faces of different ages, races and species.

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