Here we describe the ChimpFACS and use it to compare the repertoire of facial movement in chimpanzees and humans. ![]() We demonstrate that FACS can be applied to other species, but highlight that any modifications must be based on both underlying anatomy and detailed observational analysis of movements. FACS has been employed to identify the repertoire of human facial movements. We report the application of a common methodology, the Facial Action Coding System (FACS) to examine facial movement across two species of hominoids, namely humans and chimpanzees. However, cross-species comparisons are often difficult to draw due to methodological limitations. ![]() ![]() A comparative perspective has remained central to the study of human facial expressions since Darwin’s insightful observations on the presence and significance of cross-species continuities and species-unique phenomena.
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