That's exactly where they originate—Ivan Pavlov found that by associated the sound of a bell with the presentation of food, dog's would begin to drool whenever they heard the bell. Pavlov's dog ...

While researching digestion in dogs, Ivan Pavlov noticed that the dogs began to drool as soon as they saw the white coats of the people who fed them; before they could even see or smell their food.

Ivan Pavlov was born in a small village in central Russia. His family hoped that he would become a priest, and he went to a theological seminary. After reading Charles Darwin, he found that he ...