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[deleted] OP t1_j2yaaim wrote

Reply to comment by BrotherBrutha in How much a person laughs in conversation appears to be a stable trait associated with being relatable, and is not necessarily reflective of enjoyment. by [deleted]

if the mouth is open, probably

but if they smile with their teeth together then it is typically a non-aggressive sign of submission, usually in response to fear or stress. it's not typically a "happy" face for chimps.

humans are known to smile when they are nervous as well which can be confusing but probably a leftover trait from our ape ancestors

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