unconditioned response

World English Dictionary
unconditioned response
 
n
Compare conditioned response Also called (esp formerly): unconditioned reflex a reflex action innately elicited by a stimulus without the intervention of any learning process

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American Heritage
Medical Dictionary

unconditioned response n.
A natural, usually unvarying response evoked by a stimulus in the absence of learning or conditioning.

The American Heritage® Stedman's Medical Dictionary
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