Source: wikibot/second-order-stimulus
= Second-order stimulus
{wiki=Second-order_stimulus}
A second-order stimulus, also known as a conditioned stimulus, refers to a stimulus that has become associated with an unconditioned stimulus through a process called second-order conditioning. In classical conditioning, an unconditioned stimulus (US) naturally elicits a response (unconditioned response, UR) without prior learning, such as food causing salivation in dogs.