Georgii Pavlovich Zeliony (Russian: Гео́ргий Па́влович Зелёный; 1878 in Odessa – 1951) was a Russian physiologist who contributed to the understanding of conditional and unconditional reflexes. He was one of I. P. Pavlov's first students.[1] His studies of decorticated dogs[2] led to knowledge of brain function in man and other animals. In addition, he was the first to articulate the theoretical underpinnings of sociophysiology.