Extinction and Spontaneous Recovery

Extinction and spontaneous recovery are terms associated with conditioning. Extinction refers to the phenomenon when the association between the stimulus and the response weakens. For example, when Pavlov in his conditioning experiments kept presenting a conditioned stimulus to his canine subjects, but not the food, the dogs would salivate less and less. Spontaneous recovery is the re-emergence of a previously extinguished conditioned response without any further learning.