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Definition

Unconditioned response (UCR)

A response that is natural and needs no training (e.g., salivation at the small of food), is called an unconditioned response (UCR).


Unconditioned response is an innate reflex or a response that has not been learned previously; so called when produced by a given stimulus at the beginning of the conditioning procedure. For example, the unconditioned response of salivation in response to food may be used to induce salivation in response to a bell.

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