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Pavlov observing one of the dogs on which he conducted his behavorist experiments. Ivan Petrovich Pavlov (1849-1936) was a Russian physiologist and experimental psychologist who received the 1904 Nobel Prize for his work on the physiology of the digestive glands. He is best remembered for his work on conditioned reflexes, in which he conditioned dogs to salivate in anticipation of food by ringing a bell each meal time. Eventually, the bell alone provoked salivation. New York Public LIbrary Picture Collection.
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