Dictionary of Human Evolution and Biology

Dictionary of Human Evolution and Biology

Fear Grin Or Grimace

Facial expression in a lower ranking primate when confronted by a dominant conspecific in which the corners of the mouth are drawn back and the teeth show; signalling submission; in catarrhines it is used as an appeasement greeting. Aka fear face.

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grimace (See fear grin.)
bared-teeth display (See fear grin (grimace).)
habituation (1. condition in which an animal becomes unafraid of an object or individual in its environment ...)
order effects (... curious and lose its fear.)
emotion (1. inner feeling such as anger, fear, elation, etc. 2. physiological state that can be measured ...)