Final answer:
John Watson believed that the proper subject matter of psychology should be observable behavior, which is the focus of behaviorism.
Step-by-step explanation:
John Watson believed that the proper subject matter of psychology ought to be observable behavior. Watson thought that the study of consciousness was flawed and preferred to focus directly on observable behavior. This approach came to be known as behaviorism. Watson and other behaviorists used animals in experiments to study learned behavior and its interaction with inborn qualities of the organism.