Therefore, a human or animal will forget the old stimulus and become attached to the new stimulus. The terms: unconditioned stimulus, unconditioned response, neutral stimulus, conditioned stimulus, and conditioned response are crucial when explaining the process of classical conditioning. An unconditioned stimulus occurs when a stimulus will lead to a natural response without the need for any training. An unconditioned response is a natural, automatic response generated by the unconditioned stimulus. A neutral stimulus is when something initially elicits no response. For example, a specific object will have no meaning before the experiment but once the experiment ends, the object will take on a different role than before. A conditioned stimulus is a stimulus that initially had no meaning, but when paired with the unconditioned stimulus will eventually generate a conditioned response. A Conditioned Response will cause a natural and automatic response to the Neutral Stimulus because the person has been trained to react to it