A response is any reflexive action that follows a stimulus. There are two kinds of response: 1.) an unconditioned response is one that occurs without our having been trained to do so. When Pavlov’s dogs salivated over their food, they were exhibiting an unconditioned response, because it came automatically. 2.) a conditioned response is one we’ve been trained to give. When Pavlov’s dogs salivated at the sound of a bell, they were giving a conditioned response.