Fear starts in the brain, the thalamus directs signals; the amygdala produces emotion; the hippocampus brings up memories of fear. The prefrontal cortex determines the danger of the situation; and the hypothalamus activates "fight or flight"
Eyes widen, pupils dilate, eyebrows raise. Mouth opens, lips pull back. This helps you see further and take in more air. Other humans are able to recognize the look of fear, alerting them to danger. Fear is recognized in the brain faster than any other emotion.
The heart beats faster to deliver blood and oxygen to outer limbs, aiding in "fight or flight".
Because the amygdala is in hyper-drive, more memories are created in a moment of fear than in one of relaxation. Because there are more memories created when one is scared, it seems like that moment was longer than it actually was.
Small moments of fear are not harmful to your health, some people (like me) enjoy getting scared. It's an adrenaline rush.
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