Final answer:
The person most interested in studying learned behavior in psychology was Ivan Pavlov. His experiments with classical conditioning laid the foundation for the study of learned behavior. B.F. Skinner also contributed to our understanding of learned behavior through his work on operant conditioning.
Step-by-step explanation:
The person who was most interested in studying learned behavior in psychology was Ivan Pavlov.
He conducted early work in the field of behavior and studied a form of learning called classical conditioning.
Pavlov's experiments with conditioned reflexes, specifically with salivation in response to food, laid the foundation for the study of learned behavior.
Another influential figure in the study of learned behavior is B. F. Skinner, who contributed to our understanding of principles of operant conditioning.
Skinner's work demonstrated that organisms can learn even if they do not receive immediate reinforcement.
Overall, the field of behaviorism focuses on studying observable behavior and understanding how it can be learned and controlled.