Which Russian physiologist studied classical conditioning using dogs?

Which Russian physiologist studied classical conditioning using dogs? Ivan Pavlov.

Ivan Petrovich Pavlov was a Russian and Soviet physiologist whose experiments with dogs became the classic demonstration of classical conditioning. While studying digestion, he noticed that dogs began salivating not only when food appeared, but also when they encountered signals associated with feeding, such as the presence of a familiar handler.

Pavlov then paired a previously neutral stimulus, such as a metronome or buzzer, with food. After repeated pairings, the sound alone triggered salivation. The food was the unconditioned stimulus, salivation to food the unconditioned response, and the learned salivation to the sound a conditioned response.

Pavlov’s work is often simplified as “the bell and the dogs,” although accounts differ over whether a bell was the exact stimulus in his best-known experiments. Classical conditioning differs from operant conditioning: Pavlov studied involuntary responses shaped by stimulus associations, whereas later researchers such as B. F. Skinner studied how consequences change voluntary behavior. Pavlov received the 1904 Nobel Prize in Physiology or Medicine for his research on digestion, not specifically for conditioning.