Classical conditioning (also known as Pavlovian or respondent conditioning) refers to a learning procedure in which a biologically potent stimulus (e.g. food) is paired with a previously neutral stimulus (e.g. a bell). In this photograph a dog is conditioned in the laboratory of Ivan Petrovich Pavlov (1849 - 1936), a Russian physiologist known primarily for his work in classical conditioning.
Crédit:
Album / Universal Images Group / Universal History Archive