An extinguished CR will reappear if the animal is re-exposed to the original US.This is called

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Reinstatement refers to the phenomenon where a previously extinguished conditioned response (CR) reappears when the animal is re-exposed to the unconditioned stimulus (US) without the conditioned stimulus (CS) being presented again. This process demonstrates that the original learning is not unlearned but suppressed, and can be reactivated under certain conditions.

An Extinguished CR Will Reappear If the Animal Is Re-Exposed