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Startle reaction - Wikipedia, the free encyclopedia
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Startle reaction
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The startle reaction, also called the startle response, startle reflex or alarm reaction, is the
response of mind and body to a sudden unexpected
stimulus, such as a flash of
light, a loud noise (acoustic startle reflex), or a quick movement near the face. In
human beings, the reaction includes physical movement away from the stimulus, a contraction of the muscles of the
arms and
legs, and often
blinking. It also includes
blood pressure,
respiration, and
breathing changes. The
muscle reactions generally resolve themselves in a matter of seconds. The other responses take somewhat longer. An exaggerated startle reaction is called
hyperexplexia (also hyperekplexia). The exaggerated startle response is often seen in patients with
Posttraumatic stress disorder (PTSD).
Contents
Acoustic Startle Reflex
Acoustic startle reflex test for mice
The pathway for this
In summary the basic pathway follows the auditory pathway from the ear up to the Nucleus of the
See also
Moro reflex ("Startle reflex")
Prepulse inhibition - attenuation of the startle response after a weaker preceding stimulus, or prepulse.
Surprise (emotion)