Final answer:
John Watson's research is best related to 'Behaviorism and classical conditioning', as he focused on observable behaviors and developed theories based on stimulus-response, in contrast to Freudian psychoanalysis or humanistic psychology.
Step-by-step explanation:
The best search terms to use when researching a report on John Watson would be "Behaviorism and classical conditioning". John B. Watson, a prominent American psychologist, was a major proponent of the behaviorist movement, which focused on observing and controlling behavior rather than inner mental states. His work built upon the earlier research of Ivan Pavlov and further developed the concept of classical conditioning applied to both animals and humans.
Watson believed that psychology should be concerned with observable behavior, which can be measured and scientifically analyzed. This was in stark contrast to Freudian psychoanalysis, which delved into the unconscious, and humanistic psychology, which focuses on personal growth and self-actualization. Watson's focus on observable stimulus-response reactions laid the groundwork for subsequent behaviorists, like B.F. Skinner, who developed theories of operant conditioning centered around reinforcement and punishment.