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It was clear to him that dogs didnβt have to be taught to salivate when they saw food. It was hard-wired into their system. So he conducted an experiment wherein every time he fed his dogs, thus generating the unconditioned response of salivation, he would also play a metronome,* a neutral stimulus that wouldnβt cause any salivation on its own. However, after a few such trials, he began playing the metronome without giving them food. The result? An increase in salivation.