Human facial expressions as adaptations: Evolutionary questions in facial expression

Karen Schmidt and Jeffrey Cohn
Yearbook of Physical Anthropology, Vol. 44, 2002, pp. 3 - 24.


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Abstract
The importance of the face in social interaction and social intelligence is widely recognized in anthropology. Yet the adaptive functions of human facial expression remain largely unknown. An evolutionary model of human facial expression as behavioral adaptation can be constructed, given the current knowledge of the phenotypic variation, ecological contexts, and fitness consequences of facial behavior. Studies of facial expression are available, but results are not typically framed in an evolutionary perspective. This review identifies the relevant physical phenomena of facial expression and integrates the study of this behavior with the anthropological study of communication and sociality in general. Anthropological issues with relevance to the evolutionary study of facial expression include: facial expressions as coordinated, stereotyped behavioral phenotypes, the unique contexts and functions of different facial expressions, the relationship of facial expression to speech, the value of facial expressions as signals, and the relationship of facial expression to social intelligence in humans and in non-human primates. Human smiling is used as an example of adaptation, and testable hypotheses concerning the human smile, as well as other expressions, are proposed.

Notes
Associated Center(s) / Consortia: Vision and Autonomous Systems Center
Associated Lab(s) / Group(s): Face Group and Component Analysis
Associated Project(s): Facial Expression Analysis

Text Reference
Karen Schmidt and Jeffrey Cohn, "Human facial expressions as adaptations: Evolutionary questions in facial expression," Yearbook of Physical Anthropology, Vol. 44, 2002, pp. 3 - 24.

BibTeX Reference
@article{Schmidt_2002_4003,
   author = "Karen Schmidt and Jeffrey Cohn",
   title = "Human facial expressions as adaptations: Evolutionary questions in facial expression",
   journal = "Yearbook of Physical Anthropology",
   pages = "3 - 24",
   year = "2002",
   volume = "44",
}