In Pavlov's experiments he paired a sound with the presentation of food and measured salivation to each. In this experiment the unconditioned stimulus was the

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The unconditioned stimulus in Pavlov's experiment was the food, as it naturally and automatically caused the dogs to salivate without any conditioning or learning. The sound, on the other hand, was initially a neutral stimulus that only became associated with the food through conditioning.

In Pavlov's Experiments He Paired a Sound with the Presentation