<p>Why is it that a sudden loud sound or movement, or some kind of surprise tends to invoke fear?</p>

<p>This phenomenon is not restricted to humans and can also be observed in animals</p>

<p><sub><a href="http://www.imdb.com/character/ch0064640/" rel="nofollow">Sheldon Cooper</a> brought this up in <a href="http://www.imdb.com/title/tt0898266/" rel="nofollow">TBBT</a></sub></p>

<fear>
Why is surprise, sudden loud sound or movement an element of fear?
Bleeding Fingers
# Why is surprise, sudden loud sound or movement an element of fear?

(Asked by: username_0 on 2014-01-23)

Why is it that a sudden loud sound or movement, or some kind of surprise tends to invoke fear?

This phenomenon is not restricted to humans and can also be observed in animals

[Sheldon Cooper](http://www.imdb.com/character/ch0064640/) brought this up in [TBBT](http://www.imdb.com/title/tt0898266/)

**Tags:** fear


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