Ivan Petrovich (iˈvan pɪˈtrɔvitʃ). 1849–1936, Russian physiologist. His study of conditioned reflexes in dogs influenced behaviourism. He also made important contributions to the study of digestion: Nobel prize for physiology or medicine 1904
Russian physiologist who studied the digestive system of dogs, investigating the nervous control of salivation and the role of enzymes. His experiments showed that if a bell is rung whenever food is presented to a dog, the dog will eventually salivate when it hears the bell, even if no food is presented. This demonstration of what is known as a conditioned response prompted later scientific studies of human and animal behavior.