![](http://www.alamy.com/thumbs/6/B8E5424C-56EC-4240-AECA-A8A54AA73E5F/2B1TFFD.jpg)
Ivan Petrovich Pavlov, 1849 - 1936. Russian physiologist.
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Keywords: 19th, 20th, action, actions, archival, archive, century, classical, conditioning, historical, history, illustration, ivan, medicine, neurology, pavlov, petrovich, physiologist, physiology, portrait, reflex, russia, russian, science, scientist