I am struggling with this, but I will write and see if that helps.
I am glossing Annie Rogers book, Incandescent alphabets, again - in it, she describes the trajectory of Lacan’s ideas on psychosis.
In Seminar 3, from 1955-56, Lacan sees the entry into a psychotic structure (though not necessarily a psychotic break) as the foreclosure of a particular signifier - that of the Name of the Father. Note well - there is no exclusion of the real father himself here, only the symbolic father, the father’s function and name.
And in that great French pun (”nomme”/”non”), that is also the no of the Father - the signifier which says: “No, you cannot fill your mother’s lack”. This is the signifier of the Oedipus complex, the signifier that integrates the subject into a wider social order, into language, norms, laws, customs (and this may take the form of acceptance or rebellion - either way, the idea of the norm itself has been accepted).
The neurotic subject, who has heard and absorbed the Name/No of the Father has something around which he can orient himself and his questions about himself.
But when this signifier is foreclosed, when even the possibility of its existence is denied, a fundamental hole appears in the Symbolic order. And not surprisingly, psychosis tends to first hit in adolescence, when the need to position oneself, to find a network in or around which to locate one’s identity, is so important.
A couple of years later, 1957-58, and we have a text called “On a question prior to any possible treatment of psychosis,” in which Lacan makes a structural distinction between psychosis and neurosis (as Freud had done, albeit differently, in a short essay published shortly after The ego and the id) - that is, the distinction between repression and foreclosure. What is foreclosed, or refused, by definition cannot be spoken of - when it returns in the real, there is no way of symbolising or binding it - or rather, the only way to do so is via a delusion, via a voice that seems to come from without.
From this hallucination, the psychotic builds her delusion. The delusion is an attempt to make sense of the material in the hallucination. “Hallucinated experience comes in at the very point where language as a symbolic system becomes derailed” (Rogers).
What normally happens is that the Symbolic circles around the Real - via metaphor, it does its best to approximate the Real. It never quite hits the mark, but it’s good enough.
But in psychosis, words don’t circle the Real: “the Real imposes itself on speaking, and signification is shot through with impossible holes”.
Fast forward almost 20 years to Seminar 23: the Joyce seminar of 1975-76. Here, Lacan argues that one can do without the Name of the Father, the signifier of prohibition, ok, but also the fundamental signifier of the possibility of signification itself. In the previous year’s seminar, Lacan had moved away from the Name of the Father as the “lynchpin of the Symbolic”. The function of the father has changed from that which comes between and dilutes the desire of the mother, to that which produces the neurotic symptom. And we can do without this - we do not need the Symbolic to hold together the Real and the Imaginary via the Borromean Knot, if we can find the sinthome, the fourth ring, to repair it.
(This is where I am struggling - and writing it down isn’t really helping - yet.)
Colette Soler writes: “Lacan ends up by asserting that this knotting takes place via the nominating-saying, sliding from the Name of the Father, to the Father of the Name.” Which I think means that the paternal function switches from prohibiting and opening up the space for signification, to naming - and that naming, saying, is not a signifying function (it does produce meaning, as such). Rogers: “rather, saying links the Symbolic and jouissance. Any deconstruction of language (such as done by Joyce, or created at the end of analysis) leads to a reconfiguration of the Real as a saying of the Real, where saving is an event”.
I am quite lost - but I detect here a separation of speech from signification, and a conjoining of speech and enjoyment.