Flash Cards Classical Conditioning Tools A B Unconditioned Response Response that takes place in an organism whenever an unconditioned stimulus occurs. Conditioned Stimulus Originally neutral stimulus that is paired with an unconditioned stimulus and eventually produces the desired response in an organism when presented alone. Conditioned Response After conditioning, the response an organism produces when only a conditioned stimulus is presented. Unconditioned Stimulus Stimulus that invariably causes an organism to respond in a specific way. Neutral Stimulus Any input that does not set off a particular unconditioned reflex. Extinction presentation of CS without US leads to a lessening of responding and then no response Spontaneous Recovery the reappearance of the CR after a pause in extinction trials Response generalization CR triggered by stimulus similar to the CS (e.g., Little Albert)