The Seminar of Jacques Lacan, Book II: The Ego in Freud's Theory and in the Technique of Psychoanalysis, 1954-1955

Lacan's central argument is that the ego is not the seat of psychic agency but an imaginary function—a structure of misrecognition constituted through the mirror stage and reinforced by the ego's resistance to the unconscious. The seminar extends Seminar I's critique of ego psychology by systematically distinguishing the moi (the ego as imaginary object) from the je (the subject of enunciation) and from the subject of the unconscious. Where Seminar I focused on technique and the analyst's position, Seminar II develops the theoretical apparatus: the symbolic order, the Other with a capital O, and the Schema L that structures the relations between subject, ego, other, and Other. The ego's resistance, Lacan argues, is the resistance of the signified to the signifier in language .

The session on Poe's story is the seminar's most famous single installment and its most direct demonstration of the signifier's primacy over any imaginary or interpersonal content. Lacan reads the tale as a parable of the analytic situation: the letter circulates according to the position of each character in a structure that determines their actions, regardless of their intentions or psychological traits. The Queen, the Minister, and Dupin occupy positions in a chain of intersubjective relations governed by the letter's itinerary—which is to say, by the signifier. As one commentator notes, the seminar on the purloined letter is 'the first sustained engagement' with the structuralist conception of the signifier that would define Lacan's mature work . The session was later revised for inclusion in Écrits, cementing its canonical status.

Lacan deploys cybernetic tropes—circuits, feedback, chance, homeostasis, entropy—heuristically to redescribe classic psychoanalytic themes: the ego, the drives, and the symbolic order . He draws on conversations with mathematicians Georges Guilbaud and Jacques Riguet, members of the Cercle d'Études Cybernétiques, and on Jean Hyppolite's engagement with Norbert Wiener . The aim is not to reduce psychoanalysis to information theory but to furnish a language for thinking about the subject's insertion into a pre-existing symbolic network that exceeds and determines individual consciousness. Lacan's 1955 lecture 'Psychoanalysis and Cybernetics' concludes with a quasi-Heideggerian image: the human being is not master of this primordial language but is thrown into it, caught in its gears .

Introduced in the seminar session of 2 February 1955, the Schema L formalizes the relations between four terms: S (the subject or Es), a (the ego or moi), a' (the other or semblable), and A (the Other with a capital O) . The schema's diagonals represent the imaginary relation between ego and other, which comes to interrupt the unconscious relation between the subject and the Other. The vertical and horizontal vectors trace the relations that constitute the analytic field. The schema matters clinically because it locates the analyst's position: the analyst must occupy the place of the Other, not the place of the ego or the imaginary other, if the analysis is to reach the subject of desire rather than reinforce the ego's resistances .

The seminar was delivered orally during the 1954-1955 academic year within the training program of the Société Française de Psychanalyse. The French text was prepared by Jacques-Alain Miller, Lacan's son-in-law, from transcriptions of the sessions, in consultation with Lacan . Éditions du Seuil published it in 1978 as Le séminaire, Livre II: Le moi dans la théorie de Freud et dans la technique de la psychanalyse . The English translation by Sylvana Tomaselli, with notes by John Forrester, appeared in 1988 from Cambridge University Press and W. W. Norton . Like all the Seminars, the published text is a curated edition rather than a verbatim transcript, and the translation was prepared with attention to terminological consistency with prior translators of Lacan, including Anthony Wilden and Alan Sheridan .

Freud's The Ego and the Id (1923) presents the ego as a psychic agency that mediates between the id, the superego, and external reality—a structure with unconscious defenses and a reality-testing function. Lacan does not reject Freud's tripartite model but radicalizes it by insisting that the ego is fundamentally an imaginary formation, constituted through the mirror stage and the subject's alienation in the image of the other . Where Freud's ego is an agency with adaptive functions, Lacan's moi is a structure of méconnaissance—a necessary but deceptive unity that the subject mistakes for its true being. The unconscious, for Lacan, is not a region of the mind but the subject's relation to language; only the unconscious 'has all the rights to express itself by I' .