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The fight-or-flight response (also called hyperarousal, or the acute stress response) is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. [1] It was first described by Walter Bradford Cannon. [a][2] His theory states that animals react to threats with a general discharge of the sympathetic nervous system, preparing the animal for fighting or fleeing. [3] More specifically, the adrenal medulla produces a hormonal cascade that results in the secretion of catecholamines, especially norepinephrine and epinephrine. [4] The hormones estrogen, testosterone, and cortisol, as well as the neurotransmitters dopamine and serotonin, also affect how organisms react to stress. [5] This response is recognized as the first stage of the general adaptation syndrome that regulates stress responses among vertebrates and other organisms. [6]

La réponse d´approche ou de fuite (aussi appelée réponse d´hyperactivation ou de stress aigu) est une réaction physiologiue ui apparait en réponse