Sigmund Freud (1856-1939), was an Austrian psychiatrist, neurologist, psychoanalyst, and a medical. He is best-known as the founder of psychoanalysis. He wrote three influential books: The Interpretation of Dream (Die Traumdeutung) (1899), Three Essays on the Theory of Sexuality (1905), and The Future of an Illusion (1927).
Freud studied medicine at the University of Vienna, and specialized in neurology. Freud worked with Joseph Breuer in using cathartic method with hysterical disorders, later describing this procedure as what is now known as 'psychoanalysis.' Results are found in his book Die Traumdeutung (The Interpretation of Dreams).
There have been philosophical concerns as well as questions regarding the validity and scientific bearing of Freud's procedure:
Despite these philosophical concerns, the popularity of psychoanalytic treatment is apparent. However, it is important to distinguish several logically independent claims.
The popularity of psychoanalysis could be attributable to the truth of any, all or none of these claims.
In theoretical terms, Freud's division of a responsible Ego suppressing the impulses of the Unconscious also invites criticism. In particular, that it attributes conflicting intentional or purposive agency to distinct realms of the mind. The French philosopher and critic Jean-Paul Sartre criticized Freud's psychology for incoherently proposing that the conscious censor, the Ego, suppresses unconscious desires: that if the Ego is not conscious of the unconscious ideas or desires, how could it be in a position to know what must be repressed?
Despite counter claims, in general, philosophy has reacted well to Freud's theoretical principles. Freud himself suggested that "this psychology represented a new 'Copernican revolution'. Just as Copernicus had shown that the earth is not at the centre of the universe, as Darwin had shown that man is not lord and master over the animal kingdom, but merely a continuous extension of it." (Refer to source consulted: Philosophy, The Great Thinkers, by Philip Stokes).
Freud claims to have proved that "the conscious mind, or the self, is not 'master of its own house', as all rationalist and Cartesian philosophies presuppose."
Philosophy, The Great Thinkers, by Philip Stokes, Arcturus Publishing (2007)
Fontana Dictionary, edited by Alan Bullock and R.B. Woodings, (1983)