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An Unconditioned Stimulus (UCS)

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An unconditioned stimulus (UCS) is a stimulant that always produces the same unlearned response while the unconditioned response (UCR) is the natural automatic, inborn reaction to said stimulant. A conditioned stimulus (CS) is a previously natural stimulus than now elicits a certain behavior and the conditioned response (CR) is the behavior that is performed when presented with the conditioned stimulus. The UCS in this case is the tuna and the UCR is the drool produced when the cat smells the tuna since the tuna always produces the same inborn reaction, salivation. The can being opened was the natural stimulus but has now become the CS and drooling after hearing the can opened has become the CR since the cat learned to associate the sound of

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