Pavlov's dogs would salivate at the ring of a bell but not at the chime of a clock. What concept is this an example of?

Stimulus discrimination.

Explanation:

The concept of stimulus discrimination is used in both classical conditioning and operant conditioning.  In both these conditions, it implies only responding to a particular stimulus, and not responding to similar ones. It includes the ability to differentiate between one stimulus and another related stimulus. The principle of Stimulus Discrimination derives from the theory of Stimulus Generalization, that implies that one responds not only to the specific stimulus but to other related stimulus as well.

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