The fight-or-flight response (also called the fight-or-flight-or-freeze response, hyperarousal, or the acute stress response) was first described by Walter Bradford Cannon.
His theory states that animals react to threats with a general discharge of the sympathetic nervous system, priming the animal for fighting or fleeing. This response was later recognized as the first stage of a general adaptation syndrome that regulates stress responses among vertebrates and other organisms.
Read more about Fight-or-flight Response: Physiology, Psychology of The Stress Response, Behavioral Manifestations of Fight-or-flight, Negative Effects of The Stress Response in Humans
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—Woodrow Wilson (1856–1924)