The Pavlovian session (Russian: Павловская сессия) was the joint session of the USSR Academy of Sciences and the USSR Academy of Medical Sciences held on June 28 to July 4, 1950. The session was organized by the Soviet Government headed by Joseph Stalin in order to fight Western influences in Russian physiological sciences. During the session, a number of Ivan Pavlov's former students attacked another group of his students (Leon Orbeli, Pyotr Anokhin, Aleksey Speransky, Ivan Beritashvili) whom they accused of deviating from Pavlov's teaching. As the result of this session, Soviet physiology self-excluded itself from the international scientific community for many years.