The Seba library treats Real Register in 4 passages, across 4 authors (including Lacan, Jacques, James, William, Jung, C.G.).
In the library
4 passages
"the insult to the real presence" so that already no one could be mistaken, and we are not at all dealing here with a neutral reality.
Lacan directly identifies the Real Register through the concept of 'real presence,' distinguishing it sharply from neutral empirical reality and linking it to the Roman Catholic Eucharistic dogma as a structural homology for the obsessional's experience.
Lacan, Jacques, The Seminar of Jacques Lacan, Book VIII: Transference, 2015thesis
The first stage is the sensory register, a very short-term process that retains visual information for about a second and auditory information for a second or two.
This passage uses 'register' in a cognitive-psychological sense (sensory register), offering a contrasting empirical-functionalist usage that underscores by contrast the irreducibility of the Lacanian Real Register to information-processing models.
James, William, The Principles of Psychology, 1890aside
it is a real thing, not only a facon de parler. It is bordering on magic.
Jung's insistence on a figure being 'a real thing' rather than mere manner of speaking gestures toward the domain of the Real as irreducible to metaphor or symbolic convention.
Jung, C.G., Nietzsche's Zarathustra: Notes of the Seminar Given in 1934-1939, 1988aside
The use of a noncolloquial or archaizing linguistic register can blind readers to the real, inevitable, and vast gap between the Greek original and any modern translation.
The passage uses 'register' in its linguistic sense and invokes the 'real' gap between original and translation, incidentally touching the problem of what escapes symbolic mediation — a concern structurally analogous to the Lacanian Real.