Pavlov found that to produce a strong classically conditioned response the interval between the conditioned stimulus (CS)and the unconditioned stimulus (UCS) should be no more than a few seconds.

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Pavlov's research showed that a short interval between the CS and UCS leads to stronger classical conditioning. This is known as the principle of contiguity. If the interval between the two stimuli is too long, the association between them may weaken or not form at all.

Pavlov Found That to Produce a Strong Classically Conditioned Response