Final answer:
Watson believed that psychology should center on the study of observable behavior, eschewing the study of consciousness and the mind, which led to the development of the behaviorist school of thought.
Step-by-step explanation:
John B. Watson believed that psychology should involve the study of behavior. Watson was a major proponent of behaviorism, an approach that shifted psychology's focus from inner consciousness to observable behavior. Unlike structuralists and Freudians who were interested in the workings of the mind, Watson and other behaviorists emphasized the importance of learning behavior and its interaction with innate qualities within organisms. They often utilized animal models in their experiments, assuming that findings could be applicable to human behavior. Watson's stance represents a significant development in the history of psychology as a scientific discipline.