Although Freud has been originally a scientist, formed on the scientifical spirit of his age, relationship between psychoanalysis and science has never been an easy matter. Since his “Project”, from 1985, to his last texts, Freud has never left down his purpose to have psychoanalysis accepted as a legitimate science. Jacques Lacan, starting from his own theory of the discourse, confirmed psychoanalysis as a new field of knowledge which has some connections with the scientifical field of knowledge, but cannot be mixed up with it. The subject of psychoanalysis is the same as of science - the subject of the desire - but Freud, with his discovery of the unconscious mind, brings a subversion to the cogito of René Descartes.
Psychoanalysis; Science; Knowledge