Considering Lacan's reading of the case study where he notes that Schreber used common language to explain his otherwise expressively rich psychoses, approaching the sinthome but failing to escape the detrimental symptoms of psychosis, Russell Grigg observes that "there is a moment when [Schreber] is called, interpellated, by—or perhaps better 'in'—the Name-of-the-Father. This is when the lack of the signifier declares itself, and it is sufficient to trigger the psychosis."
Schreber's struggle with expressing his psychosis through language, as observed by Lacan and Grigg, highlights the interplay between language, identity, and the "Name-of-the-Father" in triggering psychotic symptoms.