In Pavlov's experiments the dog's salivation triggered by the sound of the tone was a conditioned response.
A learnt reaction to a previously neutral stimuli is referred to as a conditioned response.
The bell or other sound trained the dog to anticipate food, which made him salivate before eating. The dog was trained to expect to be fed shortly after hearing the bell after several repetitions; as a result, the salivation occurred after hearing the sound.
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