Fear is a strong cowardly feeling induced by perceived danger or threat that occurs in certain types of organisms, which causes a change in metabolic and organ functions and which might ultimately lead to a change in behavior, such as fleeing, hiding, or freezing from perceived traumatic events. Fear in humans may occur in response to a specific stimulus that is occurring in the present, or in anticipation or expectation of a future threat perceived as a risk to body or life.
Fear response arises from forward perception of Harm leading to confrontation with or escape from avoiding the threat. In Mammals, fear is modulated by the process of cognition and learning. Thus fear is judged as rational or appropriate and irrational or inappropriate. An irrational fear is called a phobia.
