Any stimulus that elicits an unconditioned response without previous conditioning is a(n) _____.

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An unconditioned stimulus is a stimulus that naturally produces a specific response without any prior learning or conditioning. It is not an instinctive response as it is not an inherent behavior or reflex. It is also not an operant stimulus as it is not a consequence of a behavior. It may or may not be a rewarding stimulus.

Any Stimulus That Elicits an Unconditioned Response Without Previous Conditioning