The Austrian psychiatrist and neurologist who created the theory and practice of psychoanalysis. Freud's major contributions included recognizing and researching the dominant role of the unconscious in both normal and neurotic behavior, the role of sexual drives or libido in psychosexual development, and the importance of dreams.
Freud's contributions to sexology include theories in the interpretation of sexual dreams, on the analysis of the unconscious and unresolved sexual conflicts developing during childhood and adolescence. a model for psychosexual development including the oral, anal, phallic, and genital stages, theories of the Oedipal and Electra complexes, and a theory for the interaction of the id, ego, and superego.
- Studies on Hysteria, with Josef Breuer (1895)
- The Interpretation of Dreams (1899)
- The Psychopathology of Everyday Life (1901)
- Three Essays on the Theory of Sexuality (1905)
- Totem and Taboo (1913)
- On Narcissism (1914)
- Beyond the Pleasure Principle (1920)
- The Ego and the Id (1923)
- The Future of an Illusion (1927)
- Civilization and Its Discontents (1929)
- Moses and Monotheism (1939)
- An Outline of Psycho-Analysis (1940)
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