Describe what occurs when the conditioned stimulus is presented over and over again without the unconditioned stimulus.

When the conditioned stimulus is presented over and over again without the unconditioned stimulus, a process called extinction occurs. Extinction refers to the gradual weakening and eventual disappearance of the conditioned response. This happens because the conditioned stimulus no longer predicts the arrival of the unconditioned stimulus, so the association between the two becomes weaker over time. As a result, the conditioned response becomes less and less pronounced until it eventually fades away. This process is a fundamental aspect of classical conditioning and demonstrates the importance of the association between the conditioned stimulus and the unconditioned stimulus in producing a conditioned response.