In classical conditioning,an unconditioned stimulus is
A) an unlearned reaction to a stimulus that occurs without previous conditioning.
B) a learned reaction to a stimulus that occurs as a result of previous conditioning.
C) a stimulus that evokes a response without previous conditioning.
D) a previously neutral stimulus that has acquired the capacity to evoke a learned response.

Question

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An unconditioned stimulus is a stimulus that evokes a response without previous conditioning. It is an innate, natural, or automatic response to a certain stimulus. Examples of unconditioned stimuli include food causing salivation or loud noises causing startle responses.

In Classical Conditioning,an Unconditioned Stimulus Is