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Conversion was a notion created by Freud in the 1890s to refer to the mechanism of the formation of hysterical symptoms and their somatic impact. It is linked to the fate of the quota of affect after the repression of ideas deemed irreconcilable for the ego. Because of its dual nature, psychic and somatic, it lies at the heart of a set of psychosomatic issues. For Freud, the theoretical model of conversion symptoms is based on the two notions of repression and somatic compliance. Parcheminey challenged the relevance of this model and proposed a genetic model referring to a supposedly early stage of somato-psychic nondifferentiation. He thus replaced the concept of a duality of functioning with that of an identity between the psychic and the somatic. For Pierre Marty, the conversion process is interpreted as a movement of regression leading to somatic fixations full of libidinal potential capable of relaunching the movement of psychic organization. Contemporary work by psychosomatists has extended the first Freudian analyses of neuroses and enriched our understanding of conversion symptoms by demonstrating their full complexity.