A Russian physiologist known chiefly for his development of the concept of the conditioned reflex Awarded the nobel prize for Physiology or Medicine in 1904 naBnoB(Ivan Pavlov) 1849-1936)Павлов (Ivan Pavlov) (1849-1936) A Russian physiologist known chiefly for his development of the concept of the conditioned reflex Awarded the Nobel Prize for Physiology or Medicine in 1904