Two-Person Psychopathology: Linguistic Style Matching Marks Disorganized Self-Referential Narrative in Psychosis

Introduction

Disturbed interpersonal attunement is a core but poorly operationalised feature of the psychopathology of schizophrenia. Language Style Matching (LSM), the largely unconscious alignment of two speakers’ function words during ordinary conversation, offers an observable, dialogue-derived index of this dyadic attunement. An open question is where altered alignment mark who a patient (a stable trait of inner experience) is or how they are (a fluctuating state that shifts with symptom severity)?

Objective

To characterise LSM over 12 months in early psychosis relative to controls, and to test, at both between- and within-person levels, whether alignment covaries with core psychopathological dimensions across self-referential (autobiographical) and externally directed discourse.

Methods

First-episode and recent-onset patients (n = 109) and controls (n = 60) completed semi- structured interviews at baseline and 12 months. LSM was computed per context and modelled with linear mixed-effects; a Mundlak decomposition partitioned the LSM–symptom association into between- and within-person components.

Results

LSM is not a fixed trait: groups were indistinguishable at baseline but diverged by 12 months (Group × Timepoint β = −0.018, p = .029), and the deficit was specific to autobiographical speech.

Within individuals, autobiographical alignment tightened as formal thought disorder rose above a patient’s own average and as negative symptoms worsened, independent of antipsychotic dose.

Conclusion

Patients aligned less than controls when speaking about themselves, yet aligned more as symptoms deteriorated — a shift from self-generated toward partner-scaffolded speech when self- organisation fails. LSM indexes disordered self-anchoring and interpersonal attunement in the negative–disorganized dimension of psychosis.