Physiological changes such as those activated when Sarah hears spooky sounds while she’s out for a run (her pupils dilate, her heart rate and blood pressure increase, etc.) are known as flight or fight response.
The fight or flight response is a physiological response that occurs automatically in response to a stressful or frightful experience.
Threat perception engages the sympathetic nervous system, causing an acute stress reaction that primes the body for either fighting or running away. A variety of clinical illnesses, including the majority of anxiety disorders, are thought to be influenced by excessively frequent, severe, or inappropriate activation of the fight or flight response.
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