reaction

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Subjects had little success in squelching their responses to the gunshot and also had problems simulating a startle reaction.
Because circuits involved are shorter, the latencies of the startle reactions are much shorter than those of voluntary reactions.
In most cases, symptoms of the ailment, including unwanted memories of violent events, startle reactions to sudden noises, and troubled relationships, first appear after a person launches a career in war coverage, Feinstein and his colleagues report in the September American Journal of Psychiatry.