[Music] [Applause] Pavlov's aim was to discover what caused saliva to flow he re-rooted the saliva IND ducts to the outside of his dog's cheek so that he could collect and measure the spittle perhaps he thought the production of saliva might be the result of a fixed nervous reflex like a knee-jerk that's me not after taking many measurements of spittle he confirmed that the dogs drooled automatically when their tongues touched food he called the response The salivation Reflex but his work started to run into trouble as his dogs became familiar with the experimental routine they started
to fill their cheek tubes before pavlof had a chance to stimulate their tongues the dogs were learning to anticipate food pavlof tried a new technique he erected screens so that the dogs couldn't see what was going on before passing meat through the hatch he introduced a stimulus that was totally unrelated to feeding a ticking [Applause] [Music] metronome at first the dog dripped saliva into its cheek tube only when the food appeared but after a number of Trials the dog began to connect the ticking with the arrival of meat soon the sound alone made the dog
drool eventually the dog salivated as much to the ticking itself as it did originally to the presentation of food fall there he called this new response the conditioned [Music] reflex whatever the stimulus his dogs could soon be conditioned to produce [Music] saliva pavlof believed that he had discovered how animals learned even in the the wild [Music]
