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After being expelled from the International Psychoanalytic Association, Lacan established the Lacanian School of Psychoanalysis. This school is based on Lacan's own theories and ideas, which differ significantly from those of Sigmund Freud, the founder of psychoanalysis. Lacanian psychoanalysis focuses on the role of language and the unconscious in human psychology, and it is often seen as a more radical and challenging form of psychoanalysis than other schools.