The startle reflex will occur in response to a sudden or unexpected noise. Using Pavlov's terms, the sudden noise would be termed the conditioned stimulus, and the startle reflex would be termed the conditioned response.

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In Pavlov's terms, the sudden noise is an unconditioned stimulus and the startle reflex is an unconditioned response because they occur naturally without prior conditioning.

The Startle Reflex Will Occur in Response to a Sudden