Primary Reinforcer: This term refers to a stimulus that is inherently rewarding and doesn't require any learning, such as food, water, or shelter.
Secondary Reinforcer: This term refers to a stimulus that becomes rewarding through its association with a primary reinforcer. For example, money can be used to obtain food (a primary reinforcer).
Extinction:This term refers to the gradual weakening and eventual disappearance of a conditioned response when the reinforcement is no longer provided.