A form of PSYCHOTHERAPY, invented and developed by SIGMUND FREUD. Places a great emphasis on the uncovering and understanding of UNCONSCIOUS MOTIVATION. Any form of psychoanalysis, no matter how far removed it may be from its Freudian origins, would subscribe to this principle. Psychoanalysis is the most arduous and demanding form of psychotherapy, requiring years of (expensive) sessions during which powerful conflicts and EMOTIONS may be raised.