Facial expressions evolved as an adversarial attack on the emotion modeling of other people. Facial emotion recognition and the archetypical emotional expressions co-evolved to compensate for these attacks.
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Then the observers evolved to correct for this, and a certain set of facial expressions that would express evolved exaggerations or signaling patterns was expected as normal (like the contemporary toothy smile as a signal for not-unfriendliness, or not-desolateness).
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Then the emotion signalers evolved to manipulate these expressions to express that the deviations that careful observers could recognize within the standard grimaces would show the "true" emotions, which leads to more fine-grained observation and a whole symbolic facial language.
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zero correlative value this example has
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