Fear is a kind of human emotion, which is scientifically defined as anti civilization emotion. It is a state of human and biological psychological activity, usually called emotion. Fear is a kind of strong depressive emotional experience that people are afraid of when they are faced with a certain dangerous situation and try to get rid of it without any help. Fear is what we usually call "fear". According to Kelly, fear is similar to threat, but to a lesser extent. When the marginal elements rather than the core construction of a person's construction system are proved invalid, fear will arise. Israeli scientists have found that a specific area of the brain becomes active after fear is generated, which leads to courage. Scientists hope to develop drugs that stimulate nerve cell activity in the center of courage to help people overcome phobia. After humans have conceptualized emotions, they should consider how to deal with fear.<br>
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