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Psychology was until about the beginning of the twentieth century regarded as a branch of philosophy. With the work of Wundt and of his contemporary experimental psychologist [William James]? (who, himself, questioned the veracity of materialistic psychology in his later work), the field of psychology was slowly but steadily established as a science independent of philosophy. Of course, like all sciences which have broken off from philosophy, purely philosophical questions about the mind are still studied by philosophers; the name of the philosophical subdiscipline which studies those questions is philosophy of mind. Most universities, journals, and researchers today treat psychology as among the experimental sciences and not as a branch of philosophy.
Both psychology and its sister study psychiatry are criticized by a vocal and well-credentialed (if small) minority in medical and academic circles as pseudo-sciences, the chief criticisms being that their theories, diagnoses and treatments do not hold up under the rigor of the scientific method and that they are not falsifiable. A related view is promulgated by a minority of philosophers under the label [eliminative materialism]?. These sorts of concerns seek to replace psychology, or some aspects of the study of psychology, with cognitive science, neuroscience, and other disciplines.
Famous Psychologists
Divisions of Psychology (these might be overlapping, of course)
Some related disciplines: