Ivan Petrovich Pavlov (; 27 February 1936) was a Russian physiologist known primarily for his work in classical conditioning. From his childhood days, Pavlov demonstrated intellectual curiosity along with an unusual energy which he referred to as "the instinct for research". Inspired by the progressive ideas which Dmitry Pisarev, a Russian literary critic of the 1860s, and Ivan Sechenov, the father of Russian physiology, were spreading, Pavlov abandoned his religious career and devoted his life to science. In 1870, he enrolled in the physics and mathematics department at the University of Saint Petersburg to study natural science. Pavlov carried out experiments on the digestive glands, as well as investigated the gastric function of dogs, and eventually won the Nobel Prize for Physiology or Medicine in 1904, becoming the first Russian Nobel laureate. A survey in the Review of General Psychology, published in 2002, ranked Pavlov as the 24th most cited psychologist of the 20th century. Pavlov's principles of classical conditioning have been found
Ivan Petrovich Pavlov (; 27 de febrero de 1936) fue un fisiólogo ruso conocido principalmente por su trabajo en el condicionamiento clásico. Desde sus días de infancia, Pavlov demostró curiosidad intelectual junto con una energía inusual a la que se refería como "el instinto para la investigación". Inspirado por las ideas progresistas que Dmitry Pisarev, un crítico literario ruso de los años 1860, y Ivan Sechenov, el padre de la fisiología rusa, se estaban propagando, Pavlov abandonó su carrera religiosa y dedicó su vida a la ciencia. En 1870, se inscribió en el departamento de física y matemáticas de la Universidad de San Petersburgo para estudiar ciencias naturales. Pavlov realizó experimentos en las zonas digestivas, así como investigó la función gástrica de los perros, y finalmente ganó el Premio Nobel de Fisiología o Medicina en 1904, convirtiéndose en el primer premio Nobel ruso.