Two opposed points of view, John B. Watson wrote in 1925, are still dominant in American psychological thinking: introspective or subjective psychology, and behaviorism or objective psychology. His statement is still true today. Reacting against traditional psychology s emphasis on feelings and introspection, and its lack of precise categories, Watson proposed a methodological approach to psychological problems that would be logical, precise, and scientific. Consciousness, he believed, was not a usable hypothesis: the proper subject of human psychology is the behavior of the human being. Behaviorism aimed to free psychology from elusive, vague concepts and establish it as a true natural science.