Ivan Petrovich Pavlov (1849 - 1936), Russian physiologist. Noted for behavioral experiments in which he sounded a bell while presenting food to a dog, thereby stimulating the natural flow of saliva in the dog's mouth. After the procedure was repeated several times, thedog would salivate at the sound of the bell, even when no food was presented. —3rd South African published appr gls (14.4.92)