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Potentiation or diminution of discrete motor unconditioned responses (rabbit eyeblink) to an aversive pavlovian unconditioned stimulus by two associative processes: Conditioned fear and conditioned diminution of unconditioned stimulus processing.
In a natural setting in which there is no manipulation or coercion, the UCS, the smell or sight of food, caused the unconditioned response (UCR) which was salivation.
Interneurons in the Pathway of the Unconditioned Response
Effects of CS-US interval on unconditioned response diminution in human heart-rate classical conditioning.