Final answer:
Stimulus discrimination means that an organism responds to differences among the values of two or more stimuli. It occurs when an organism learns to respond differently to various stimuli that are similar.
Step-by-step explanation:
Stimulus discrimination means that an organism responds to differences among the values of two or more stimuli. It occurs when an organism learns to respond differently to various stimuli that are similar. For example, Pavlov's dogs discriminated between the basic tone that sounded before they were fed and other tones, because the other sounds did not predict the arrival of food. This is opposite to stimulus generalization, where the organism demonstrates the conditioned response to stimuli that are similar to the conditioned stimulus.