After spending two decades studying the digestive system,________ realized that certain "psychic secretions" pointed to a fundamental form of learning.

Question

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The mention of "psychic secretions" and the study of the digestive system points towards the research done by Ivan Pavlov on classical conditioning and his experiments with dogs. B.F. Skinner, Rosalie Rayner, and John B. Watson are known for their contributions to behaviorism but not specifically related to the digestive system or classical conditioning experiments with dogs.

After Spending Two Decades Studying the Digestive System,________ Realized That