PRINCIPLES OF THEORY OF MENTAL HIERARCHY: ON CORRELATION OF UNIVERSAL AND UNIQUE IN HUMAN BEING’S PSYCHE A. V. Libin PhD, department of medicine and rehabilitation, Georgetown University; director of training programs, Research Center of Neurosciences; Institute Medstar and National rehabilitation hospital, Washington, USA The article represents the conceptual integration of authors’ approaches and is a logic continuation of theoretical and experimental analysis of the nature of psychic processes carried out for more than fifty years (1949-2001) by L.M. Vekker and fifteen-years cycle of methodological researches in the sphere of general and differential psychology conducting by A.V. Libin. Both approaches to the nature of man’s psyche and personality as its central formation study are synthesized in the author’s system. Principles of mental hierarchy are examined in the work in the context of comparative analysis of universal - in the form of physical laws of live systems functioning and unique – manifesting itself in the specific character of nature - and - social organization of psychic processes as quite particular class of objective phenomena. Key words: mental representation, neurodynamics of image, tactile- kinesthetic modality, principles of theory mental hierarchy, mental space-time, isomorphism scale.