Figure 4.

Eyeblink classical conditioning is a form of associative learning in which a previously neutral stimulus such as a tone or light (CS) is presented briefly before a blink-inducing unconditioned stimulus (US), such as a puff of air to the eye or a shock to the muscles around the eye. In the standard delay paradigm, the CS and US overlap, and coterminate. After repeated pairings, the animal learns to associate the stimuli and begins to blink to the CS before the onset of the US – a behavior termed conditioned response (CR).