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| The startle reaction, (also called startle response, alarm
reaction or, mistakenly, startle reflex), is the complex,
involuntary response of mind and body to a sudden unexpected
stimulus, such as a flash of light, a loud noise, 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, breathing and hormonal
changes.. The muscle reactions generally resolve themselves in a
matter of seconds. The other responses take somewhat longer.
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