What is the term for the sudden stimulus experienced when frightened or threatened?

The term "fight-or-flight syndrome" accurately describes the physiological and psychological responses that occur when an individual perceives a threat or experiences fear. This response is rooted in the body's instinctive survival mechanisms, where the sympathetic nervous system is activated, leading to a series of changes designed to prepare the body to either confront the threat or flee from it.

During this response, several bodily functions are heightened; for example, heart rate and blood pressure increase, breathing becomes more rapid, and the body releases adrenaline and other stress hormones. These changes collectively allow for enhanced physical performance and awareness in dangerous situations.

Understanding the fight-or-flight syndrome is crucial, especially in high-stress environments like diving. It helps divers recognize their body's reactions when faced with frightening underwater scenarios, allowing for better management of stress during dives. This response contrasts with terms like "relaxation response," which refers to the body's process of calming down after stress, and "adrenaline rush," which is the immediate surge of adrenaline that occurs but is part of the larger fight-or-flight response. "Stress response," while encompassing the general body's reaction to stress, is broader and not as specific as fight-or-flight. Therefore, "fight-or-flight syndrome" is the most accurate term for the