startle response

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Noun1.startle response - a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions
startle, jump, start - a sudden involuntary movement; "he awoke with a start"
References in periodicals archive ?
SITUATION: An unintended discharge due to startle response results in tragedy.
Alterations in arousal, such as irritability, angry outbursts, reckless behavior, and exaggerated startle response.
The fear memory was calculated by subtracting the baseline startle response -- to the sound on the 'good' colour -- from the response to the sound when the 'bad' colour was showing.
Changes in arousal and reactivity as shown by irritable behavior, reckless behavior, hypervigilance, an exaggerated startle response, concentration problems, or sleep disturbance.
The startle response (limbic hijack) is a physical and mental reaction to a sudden unexpected stimulus.
Startle response resulting in unintended discharge is also a very real possibility.
Conditioned fear as revealed by magnitude of startle response to an auditory stimulus.
If a weaker stimulus is emitted beforehand as a "prepulse," the startle response is lower.
Interestingly, the startle response of the insect was completely stifled, and it continued its pace despite observation by the authors.
Mang, Siegmund, and Blouin induce whiplash and consider the role of a startle response using electromyography (EMG) outcome measures.
If infants do not learn that the world is safe, and to understand sensory input, they will retain these reflexes as a primary reaction to danger, or perceived danger, and will not develop a good adult startle response that will allow them to realistically understand sensory information and their safe place in the world.
Affective modulation of startle reflex during perception is a highly stable and replicable finding that has been explained according to the motivational priming hypothesis (Lang, Bradley, & Cuthbert, 1997), in which activation of the defensive motivational system by an unpleasant stimulus primes related reflexes, such as the startle response.