startle stimulus

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• Startle reaction — 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 …   Wikipedia

• startle reaction — ▪ psychology also called  Startle Pattern,         an extremely rapid psychophysiological response of an organism to a sudden and unexpected stimulus such as a loud sound or a blinding flash of light. In human beings it is characterized by… …   Universalium

• startle reaction — noun 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 • Syn: ↑startle response • Hypernyms: ↑startle, ↑jump, ↑start * * *… …   Useful english dictionary

• startle response — noun 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 • Syn: ↑startle reaction • Hypernyms: ↑startle, ↑jump, ↑start * * *… …   Useful english dictionary

• startle pattern — noun or startle reaction or startle response : the complex of psychophysiological changes that is elicited in an organism by an unexpected sudden stimulus (as a loud noise) and includes tremor, sweating, palpitation, dry mouth, and a feeling of… …   Useful english dictionary

• startle reaction — the various psychophysiological phenomena, including involuntary motor and autonomic reactions, evidenced by an individual in reaction to a sudden, unexpected stimulus, as a loud noise …   Medical dictionary

• Prepulse inhibition — (PPI) is a neurological phenomenon in which a weaker prestimulus (prepulse) inhibits the reaction of an organism to a subsequent strong startling stimulus (pulse). The stimuli are usually acoustic, but tactile, light, airpuff stimuli are also… …   Wikipedia

• Moro reflex — startle reflex a primitive reflex seen in newborn babies in response to the stimulus of a sudden noise or movement: the baby will fling its arms and legs wide and will appear to stiffen; the arms and legs are then drawn back into flexion. The… …   The new mediacal dictionary

• Reflex — A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in response to a stimulus applied to the periphery and transmitted to the… …   Medical dictionary

• Mauthner cell — The Mauthner Cells are a pair of big and easily identifiable neurons (one for each half of the body) located in the rhombomere 4 of the hindbrain in fish and amphibians that are responsible for a very fast escape reflex (in the majority of… …   Wikipedia

• animal learning — ▪ zoology Introduction       the alternation of behaviour as a result of individual experience. When an organism can perceive and change its behaviour, it is said to learn.       That animals can learn seems to go without saying. The cat that… …   Universalium