startle reaction

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Definitions from WordNet

Noun startle reaction has 1 sense

startle response, 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
--₁ is a kind of startle, jump, start

Definitions from the Web

Startle Reaction

Definition

The Startle Reaction refers to the sudden and involuntary response of the body to a sudden, unexpected stimulus, typically involving a quick physical or emotional start accompanied by a heightened state of alertness.

Example Sentences

When the fire alarm went off, everyone had a startle reaction, jumping out of their seats.
The loud thunder in the middle of the night caused a startle reaction in the sleeping baby.
His sudden appearance at the door startled her, and the startle reaction made her drop the fragile vase she was holding.

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