From "The Papin Sisters"

The aggressive drive, which resolves itself in murder, thus appears to be the malady that serves as the foundation of psychosis. We can call the drive unconscious, signifying that the intentional content which translates it into the conscious mind cannot manifest itself without a compromise with the social demands integrated by the subject, that is to say, without a camouflage of motives, which is quite precisely delirium.

Angoisse de morcellement

L'angoisse de morcellement est un concept psychanalytique désignant une modalité de l'angoisse trés précoce dans le fonctionnement psychique, présente dès les premiers mois de vie du bébé.
Contrairement à l'angoisse de castration qui survient plus tardivement, au cours de la période dite oedipienne et qui concerne l'angoisse d'avoir ou de perdre, l'angoisse de morcellement concerne l'identité et le maintien d'un moi différencié du non-moi et unifié. Ce type d'angoisse se retrouve ensuite chez les patients présentant des troubles psychotiques.

Eat MY Dasein! ("Seminar on The Purloined Letter")

You think you act when I stir you at the mercy of the bonds through which I knot your desires. Thus do they grow in force and multiply in objects, bringing you back to the fragmentation of your shattered childhood. So be it: such will be your feast until the return of the stone guest I shall be for you since you call me forth.

Texto completo de "Seminar on The Purloined Letter":
http://www.lacan.com/purloined.htm

Foreclusion

Foreclusion (also known as Foreclosure) refers to a process seen by French psychoanalyst Jacques Lacan as being central in the development of psychosis.

In order for the realm of The Symbolic to be bound to the realms of The Imaginary and The Real, Lacan postulates the existence of a paternal function (The Name of the Father or Primordial Signifier). This function prevents the developing child from being engulfed by its mother and allows him/her to emerge as a separate entity in his/her own right. It is a symbol of parental authority (a general symbol that represents the power of father of the Oedipus Complex) which brings the child into the realm of the symbolic by forcing him/her to act and to verbalise as an adult. The three realms are now integrated in a way that is conducive to the creation of meaning and successful communication by what Lacan calls a Borromean knot.

In some cases the paternal function is foreclosed from the Symbolic Order. When this happens, the realm of the Symbolic is insufficiently bound to the realm of The Imaginary and failures in meaning can later occur (the Borromean knot becomes undone, completely disconnecting the three realms). Psychosis is experienced after some environmental trigger in the form of a signifier that the individual cannot assimilate. The fabric of the individual's reality is ripped apart and no meaningful symbolic sense can be made of experience. Psychotic delusions or hallucinations are the result of the individual's striving to account for what they are experiencing.