A terrified facial expression actually has a purpose. Screaming in terror and the face you make when you're frightened actually boost your chances of survival in perilous situations. How?
Why do we scream in terror?
Screams of Terror - Science on the Web #29
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Key Facts In This Video
The faces we make when scared are unconsciously strategic and boost our chances of survival. 00:42
Risorius muscle controls expressions of fear and terror. 01:22
The more irregular a scream or yell is, the harder it is to be ignored. 01:50