Russian physiologist (1849-1936) best known for his investigation of conditioned reflex through the use of experiments involving salivating dogs. He was awarded the Nobel Prize in Medicine in 1904. Highly sought-after matte-finish 4.75 x 6.5 candid photo of Pavlov in a lab coat, signed in fountain pen, "I. Pavlov." Affixed to a same-size mount. In fine condition. An exceedingly scarce format. Previously sold by Christie's, 2007.
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