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

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In Pavlov's experiments, salivation was both a conditioned and unconditioned response. Initially, salivation was an unconditioned response to food (the unconditioned stimulus). After pairing the buzzer (a neutral stimulus) with food, the buzzer became a conditioned stimulus, and salivation in response to the buzzer became a conditioned response. Thus, salivation served as both types of responses depending on the stimulus presented.

In Pavlov's Experiments He Paired the Presentation of Food with a Buzzer