Abstract
As the principal theories of psychosomatic medicine, there are two that should be mentioned: the theory of psychoanalysis by Freud and the theory of conditioned reflex by Pavlov. These two theories, which are often quoted in contrast, have many incompatible elements. Thus, the need for developing a third theory which could be commonly acceptable to both of them. Wiener's (1) cybernetics and von Bertalanffy's (2) general system theory, can be considered to comply with this requirement. We will try to explain the theory of psychosomatic medicine, with special emphasis on the rationable for diagnosis of psychosomatic disease, and that for treatment, in the light of the following principles adapted from cybernetics and the general system theory: (1) the black box principle; (2) the open system principle; (3) the feed back principle, and (4) the information and energy principle.
