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. Author manuscript; available in PMC: 2010 Feb 23.
Published in final edited form as: Curr Dir Psychol Sci. 2007 Jun 15;16(3):117–122. doi: 10.1111/j.1467-8721.2007.00487.x

Fig. 3.

Fig. 3

Proposed facial expression homologues in chimpanzees and humans. From left to right, the chimpanzee expressions show the bared-teeth display, pant-hoot, play face, scream face, and bulging-lip face. Corresponding human expressions are shown in the top row, along with the action units (AUs) shared by the expressions in both species. (Human photos from Ekman, Friesen, & Hager, 2002; chimpanzee photos courtesy L.A. Parr and the Living Links Center, Emory University.)