The Seminar of Jacques Lacan, Book III: The Psychoses, 1955-1956

Lacan's central thesis is that psychosis is a structural consequence of the foreclosure (Verwerfung) of a primordial signifier—the Name-of-the-Father—which prevents the subject from being anchored in the symbolic order through the paternal metaphor. The seminar rejects the psychiatric view of psychosis as a deficit of reason or a neurological dysfunction, and equally rejects the psychoanalytic tendency to treat psychosis as an exaggerated version of neurosis. Lacan argues that psychosis involves a fundamentally different relation to language: the psychotic is 'inhabited, possessed by language' rather than speaking through it . The famous question animating the seminar—what does it mean to be a father?—is answered structurally: paternity is a symbolic function, not a biological fact, and its failure produces the psychotic structure.

Foreclosure (forclusion, translating Freud's Verwerfung) is the mechanism Lacan identifies as specific to psychosis. Where repression (Verdrängung) operates in neurosis by pushing unacceptable representations into the unconscious, foreclosure rejects a signifier from the symbolic order altogether—it is not repressed but 'foreclosed,' cast outside the subject's symbolic universe. The foreclosed signifier is the Name-of-the-Father, the signifier that would anchor the subject in the chain of signification through the paternal metaphor. Without this anchor, the subject lacks the symbolic coordinates necessary for stable meaning, and the foreclosed element returns in the real—as hallucination, delusion, or the experience of being spoken by an Other that does not exist as such. Lacan's hypothesis built on Freud's Schreber analysis but formalized it linguistically.

Daniel Paul Schreber's Memoirs of My Nervous Illness provided Freud with the material for his 1911 analysis of paranoia, and Lacan returns to both texts as the seminar's primary case study. Schreber's delusional system—his transformation into a woman, his relation to divine rays, his persecution by God—became for Lacan a privileged demonstration of how the psychotic subject reconstructs reality through language when the symbolic order fails. Lacan draws on Schreber's own account and Freud's notes to show that the psychotic is not merely deluded but structurally inhabited by language . The Schreber case allows Lacan to trace how the Name-of-the-Father's foreclosure produces a different organization of the symbolic register, one in which the subject's relation to the Other is fundamentally altered .

In a clinical presentation, a patient reports hearing a man—her neighbor's lover—call her 'marrana' (sow) after she said 'I've just been to the butcher's.' Lacan uses this example to illustrate the psychotic's altered relation to the big Other. In the neurotic structure, the subject receives their own message in inverted form from the Other, which serves as the guarantor of meaning. In psychosis, the big Other is foreclosed; the subject does not receive the message from the Other but from the small other (the semblable), and the circuit closes on the imaginary plane rather than the symbolic . The hallucinated 'marrana' and the innocent remark 'I've just been to the butcher's' form a single message addressed to the subject from the place where the Other should be but is not.

Seminar III is the first place in Lacan's teaching where the question of the father and its structuring role in psychic becoming takes center stage . Before this seminar, Lacan's emphasis had been largely on the imaginary and the mirror stage; Seminar III marks the decisive turn toward the symbolic and the Name-of-the-Father as the pivot of psychic structure. The distinction between neurosis and psychosis, grounded in the presence or absence of the paternal metaphor, becomes a foundational axis of Lacanian theory. The seminar also establishes the clinical importance of psychosis for psychoanalysis, correcting the received idea that analysis reduces to the child's erotic relation to the mother. The Schreber case and the foreclosure hypothesis would remain central to Lacanian clinical practice and teaching.

The seminar was delivered orally during the 1955-1956 academic year and published in French by Éditions du Seuil in 1981 as Le séminaire, Livre III: Les psychoses, with the text established by Jacques-Alain Miller . The English translation by Russell Grigg appeared from Routledge in 1993, with a reprint in 2000 . The English edition runs 341 pages. Italian translations appeared in 1985 and a new edition in 2010, and a German translation by Michael Turnheim was published in 1997 . As with all the Seminars, the published text is a curated edition prepared by Miller from transcriptions of the sessions, not a verbatim record—a mediation that shapes how Lacan's oral teaching is received in written form.