Intact Mismatch Negativity Responses in Clinical High-Risk for Psychosis and First-Episode Psychosis: Evidence from Source-Reconstructed Event-Related Fields and Time-Frequency Data.

Dheerendra, Pradeep; Grent-'t-Jong, Tineke; Gajwani, Ruchika; Gross, Joachim; Gumley, Andrew I; Krishnadas, Rajeev; Lawrie, Stephen M; Schwannauer, Matthias; Schultze-Lutter, Frauke; Uhlhaas, Peter J (2024). Intact Mismatch Negativity Responses in Clinical High-Risk for Psychosis and First-Episode Psychosis: Evidence from Source-Reconstructed Event-Related Fields and Time-Frequency Data. Biological psychiatry. Cognitive neuroscience and neuroimaging, 9(1), pp. 121-131. Elsevier 10.1016/j.bpsc.2023.09.006

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BACKGROUND

To examine whether Mismatch Negativity (MMN) Responses are impaired in participants at clinical high-risk for psychosis (CHR-P) and first episode psychosis (FEP) patients and whether MMN-deficits predict clinical outcomes in CHR-Ps.

METHODS

Magnetoencephalography (MEG) data were collected during a duration-deviant MMN-paradigm for a group of 116 CHR-P participants, 33 FEP patients, (15 antipsychotic-naïve), a psychosis-risk-negative group (CHR-N: n=38) with substance abuse and affective disorder and 49 healthy controls (HC). Analysis of group differences of source-reconstructed event-related fields as well as time-frequency and inter-trial-phase-coherence (ITPC) focused on bilateral Heschl's gyri and superior temporal gyri.

RESULTS

Significant MMNm responses were found across participants in bilateral Heschl's gyrus and superior temporal gyri. However, MMN-amplitude as well as time-frequency and ITPC-responses were intact in CHR-P and FEP-patients relative to HC. Furthermore, MMN-deficits were not related to persistent attenuated psychotic symptoms nor transitions to psychosis in CHR-Ps.

CONCLUSIONS

Our data suggest that MMNm responses in MEG-data are not impaired in early-stage psychosis and may not predict clinical outcomes in CHR-P participants.

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