startle response
Involuntary defensive twitch
The startle response is an involuntary physical reaction to a sudden unexpected stimulus—typically a loud noise, bright flash, or unexpected touch.
The body tenses, the heart rate spikes, and a person may flinch, jump, or cry out.
This reflex is hardwired and nearly universal across mammals, serving as a protective mechanism that prepares the body to respond to potential threats.
The car backfiring triggered an intense startle response in everyone on the sidewalk.
- flinchInvoluntary retreat from threat
- joltAbrupt forceful shake
- reflexInvoluntary stimulus response
- knee-jerk reactionInstinctive, unconsidered response
- gaspSudden sharp breath
jump · jump scare · fright · alarm · loud noise · twitch · adrenaline · shock · deer in headlights · recoil · heartbeat · freeze · instinct · nervous system · sudden · loud · unexpected · vigilance
- animal behaviorsswimming, running, walking, jumping, flying
- body reactionssweating, blushing, shiver, goosebumps, twitch
- body responsesfight, flight, shivering, freeze, goosebumps
- instinctsinstinct, survival instinct, survival instincts, maternal instinct, gut instinct
- reflexesreflex, reflexes, reflex action, quick reflexes, stretch reflex
- automatic processesbreathing, heartbeat, reflex, digestion, blinking
startle responserelaxation response
Body's stress-reversing state
resting state · calm · relaxation · equanimity · composure
startle responsehabituation
Diminished reaction over time
desensitization · conditioned response · adaptation · acclimation · acclimatization
startle, startled, startling, startles, response, respond, responds, responded, responding