Whats the scientific reason behind this reaction??
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Darwin argued that humans have evolved a set of universally recognizable facial expressions that reveal their emotional state to others, and psychologists (e.g. Ekman) have confirmed that some facial expressions are indeed recognized in the same way worldwide (but others have shown that culture also plays a modifying role). In the perspective of evolution, it might be somewhat by chance that the open mouth was the expression that came to be associated with surprise/shock, it could just as well have been a different facial expression that evolved to have this role.
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