startle reaction

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Noun1.startle reaction - 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 ?
Our patients may be categorized as having the major form, which is characterized by exaggerated startle reaction and generalized muscular stiffness starting in the childhood and progressively decreasing as the child grows.
Concomitant responses in OOc and/or SCM, indicating a generalized startle reaction, may serve to differentiate early released motor responses due to stimulus intensity alone from those due to additional startle effects.
If diagnosed correctly, babies can be treated with drugs that help reduce the unwanted startle reaction and also reduce muscle stiffness."
These results demonstrate that the time difference is practically negligible, particularly if you factor in startle reaction and threat recognition.