What is the stimulus-response theory in psychology?

Education theory. In the act of classical conditioning, the learner comes to respond to stimuli other than the one originally calling for the response (as when dogs are taught to salivate at the sound of a bell) One says in such a situation that a new stimulus is learned

The learner will respond to stimuli besides the one calling for the response, the experiment where the dog is taught to drool when he hears a bell ring, they would say a new stimulus is learned.