Final answer:
The terms used to describe changes in classically conditioned responses are 'extinction', where there is a decrease in the conditioned response when the unconditioned stimulus is no longer paired, and 'generalization', where an organism shows a conditioned response to similar stimuli.
Step-by-step explanation:
The terms used to describe changes in classically conditioned responses include extinction and generalization. Extinction is the process where there is a decrease in the conditioned response because the unconditioned stimulus is no longer paired with the conditioned stimulus. This leads to a gradual weakening and disappearance of the conditioned response. Generalization, on the other hand, occurs when an organism demonstrates the conditioned response to stimuli that are similar to the conditioned stimulus, even if they are not exactly the same.
Stimulus discrimination is another term relevant to classical conditioning, which is the ability of an organism to respond differently to similar but distinct stimuli. For example, a cat may differentiate the sound of a can opener (associated with being fed) from the sound of an electric mixer (not associated with being fed) and only respond to the former by running to the kitchen.