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unconditioned stimulus

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noun
psychol any stimulus evoking an unlearnt response, esp in the context of classical conditioning, in which the conditioned stimulus is followed by the unconditioned one
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Medical definitions for unconditioned stimulus

unconditioned stimulus

n.
A stimulus that elicits an unconditioned response; for example, food is an unconditioned stimulus for a hungry animal, and salivation is the unconditioned response.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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