A puff of air against an open eye causes the eye to blink reflexively. In this instance, the puff of air is an example of a(n) __________.

A) conditioned stimulus
B) unconditioned stimulus
C) reinforcer
D) neutral stimulus

Unconditioned Stimulus

In classical conditioning, it is any stimulus that naturally triggers a reflexive response without the need for prior learning.

Conditioned Stimulus

A previously neutral stimulus that, after being paired with an unconditioned stimulus, elicits a conditioned response by association.

Reinforcer

A stimulus delivered after a response that makes the response more likely in the future.