According to Ivan Pavlov's theory of Classical Conditioning, when a dog is conditioned to salivate to the sound of a bell paired with food, and subsequently the conditioned response undergoes extinction through repeated presentation of the bell alone without food, the sudden reappearance of the conditioned response solely to the sound of the bell after a time delay, without any retraining, most accurately illustrates which psychological phenomenon?

Detailed Analysis of Classical Conditioning Concepts

In Ivan Pavlov's theory of classical conditioning, after a conditioned response undergoes extinction, introducing a rest period often leads to the sudden reappearance of the conditioned response when the conditioned stimulus (the bell) is presented again without any new learning or retraining.

• Spontaneous Recovery: This phenomenon demonstrates that extinction does not mean permanent unlearning, but rather temporary suppression of the conditioned response.
• Stimulus Discrimination: The ability to differentiate between a conditioned stimulus and other similar stimuli.
• Higher-Order Conditioning: Pairing a neutral stimulus with an already established conditioned stimulus.

Therefore, the correct psychological phenomenon describing this sudden reappearance is Spontaneous Recovery.