... , whose theory was that the reflex is the essence of all reactions. Pavlov went further and discovered that the conditional reflex is a response, which is not directly connected with the stimulus, but caused by association with a previous experience. The conditioned reflex was discovered in the following experiment on a dog. A bell rung just before a dog was fed; the dog salivated on receiving ... very close in time to the unconditioned stimulus, if the bell louder, or if the dog was trained on larger pieces of meat the amount of salivation would be larger. This discovery was very import...

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• Grade Level: Undergraduate