The current view of why classical conditioning works the way it does, advanced by Rescorla and others, adds the concept of to conditioning theory.

Expectancy.

Explanation:

Robert A. Rescorla is an American psychologist who studies learning mechanisms, together with Allan R. Wagner developed the Rescorla-Wagner Learning Model based on Classical Conditioning.

This model takes the contiguity principles of Pavlovian conditioning and replaces them with an expectation model as an alternative; states that a conditioned response can be given in the expectation of the occurrence or non-occurrence of the stimulus, rather than the stimulus itself.

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