Which of the following responses by dogs in Pavlov's laboratory triggered Pavlov's interest in conditioning?

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Pavlov's interest in conditioning was triggered when he noticed that the dogs began to salivate right before the food was presented to them, indicating that they had learned to associate the sound of the food delivery with the arrival of food. This led to further experiments and the development of classical conditioning theory.

Which of the Following Responses by Dogs in Pavlov's Laboratory