Ivan Pavlov
Russian physiologist, 1849-1936
"Ivan Petrovich Pavlov was a Russian physiologist known primarily for his work in classical conditioning. Pavlov's dog is named in his honour. Pavlov had learned that when a buzzer or metronome was sounded in subsequent time with food being presented to the dog in consecutive sequences, the dog would come to associate the sound with the presentation of the food and salivate upon the presentation of that stimulus. Pavlov’s ""The Work of the Digestive Glands"" (1897) served as a base for broad research on the digestive system. His experiments earned him the 1904 Nobel Prize in Physiology and Medicine."
Source: Wikipedia
Russian physiologist known primarly for his work in classical conditioning; Nobel Prize in 1904 (1839-1936). Photograph signed „Ivan Pavlov". no place, no date. 9¼ x 7 inch.
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Pavlov signed at lower right. Bachrach, the photographer, signed at lower right. A wonderful, waist-up portrait. - His most famous experiment involved ringing a bell each time before he gave a dog food. The dog would begin to salivate to salivate in response to the bell. Pavlov called the bell a conditioned stimulus because of its association with food. He won the Nobel Prize for Physiology or Medicine in 1904.