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Typically, an unconditioned response or reflex that is elicited by an unconditioned stimulus will show habituation if the stimulus is repeated (Gluck et al.
For unconditioned, aversive, fearful stimuli, when expectancy of the unconditioned fearful stimulus increases by pairing it with a conditioned stimulus, UCR diminution is detected in the amygdala and the anterior cingulate, auditory and dorsolateral prefrontal cortices, with an inverse relationship between unconditioned stimulus expectation and unconditioned response.
Sometimes it even merges into the larger unconditioned response without a separate maximum at all.