Fear is something that we have all felt at one time or another in our lives. It is a basic survival mechanism that is in response to a certain kind of stimuli, such as pain or the threat of danger. If you were to see somebody that has a look on their face similar to the one in the picture, the first thing that may cross your mind is "What are they afraid of?" Fear also has many physical side effects including rise in blood pressure and heart rate, a tightening of the muscles, sharpened senses, and dilation of the pupils, to allow more light in.
The fear facial expression is more of a tightening of all the muscles of the face rather than just a few of them. It includes the lips stretching horizontally, lower eyelids are tensed and the upper eyelids are raised. The eyebrows will also be raised and pushed together.
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