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 ...

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Pavlov noticed that his canine subjects would start to drool whenever they saw the lab technician who usually fed them. He realised that the dogs had come to associate the handler with eating ...

In simple terms: Pavlov would ring a bell prior to feeding his dogs (his test subjects); the dogs were quickly conditioned and came to associate the ringing of the bell with the presentation of food.