Answer:
Extinction
Step-by-step explanation:
For example, your dog will naturally salivate at he sight of food, but if you train your dog to salivate when you ring a bell when presenting food to it, the dog overtime associates the bell with food, and would salivate anytime you ring a bell even without presenting its food.
The salivation that is stimulated by the ringing of the bell even in the absence of food is the conditioned response.
The ringing of the bell is the conditioned stimulus, while the food that naturally initiates salivation is the unconditioned stimulus.
Overtime, if you keep ringing the bell (conditioned stimulus) only without presenting food (unconditioned stimulus), your dog would gradually stop salivating without sighting food. This reduction or decrease in the conditioned response (salivating) is what is referred to as extinction.