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   Stimulus Discrimination is when we learn to respond only to the original stimulus, and not to other similar stimuli. The concept of Stimulus Discrimination follows from the idea of Stimulus Generalization, which is when we respond not only to the original stimulus, but also to other similar stimuli.

   Stimulus Generalization is the act or process of responding to a stimulus similar to but distinct from the conditioned stimulus.

Stimulus Discrimination versus Stimulus generalization