title: On the psychoanalytic theory of instinctual drives. I: The beginnings of Freud's drive theory.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004328:Drive; D005619:Freudian Theory; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007323:Instinct; D008418:Masturbation; D009424:Nervous System Physiological Phenomena; D011574:Psychoanalytic Theory; D011606:Psychosexual Development