Why do we show emotion in our face?
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Non-verbal communication is probably one of the most basic forms of communication animals have, and humans are very social creatures
We love gathering in groups, and interacting with those groups. Facial expression is useful for quickly conveying info, without needing to so much as open your mouth.
If I have a scowl, bearing my teeth at you, nearly foaming at the mouth, I am clearly threatening you, and you should either lift up your hands, or back off.
If I’m in severe pain, I might not be able to talk because of it. But my face tells you everything you need to know.
Most basic facial expressions are also understood regardless of culture; meaning I can express this basic info to people, even if I don’t speak their language.
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