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Abnormal Effective Connectivity Underlying Auditory Mismatch Negativity Impairments in Schizophrenia
Daisuke Koshiyama1, Makoto Miyakoshi2, Yash B Joshi1
1Department of Psychiatry, University of California San Diego, San Diego.
Auditory mismatch negativity (MMN) reduction in schizophrenia is linked to altered temporofrontal brain connectivity. Impaired MMN in patients involves frontal midline sources and abnormal network dynamics, correlating with symptom severity.
Area of Science:
- Neuroscience
- Psychiatry
- Biomarkers
Background:
- Auditory mismatch negativity (MMN) is an event-related potential biomarker with reduced amplitude in schizophrenia, correlating with symptom severity.
- Scalp-recorded MMN arises from distributed temporofrontal neural sources, but their specific contributions and interactions in schizophrenia remain unclear.
Purpose of the Study:
- To identify independent sources of MMN.
- Characterize effective connectivity patterns in schizophrenia.
- Explore the clinical significance of abnormal MMN source dynamics.
Main Methods:
- Applied a data-driven analytic framework to large cohorts of healthy subjects (n=449) and schizophrenia patients (n=589).
- Identified MMN contributing sources and analyzed effective connectivity patterns.
Main Results:
- Identified 11 independent MMN sources across temporofrontal cortices.
- MMN reduction in schizophrenia is associated with decreased contributions from orbitofrontal, anterior cingulate, and middle cingulate cortices.
- Schizophrenia patients exhibit altered temporal-to-prefrontal and reduced cross-hemispheric prefrontal connectivity, linked to negative symptom severity.
Conclusions:
- Alterations in dynamic interactions among temporofrontal sources underlie MMN abnormalities in schizophrenia.
- Findings enhance understanding of neural substrates in information processing.
- Results offer novel applications for translatable biomarkers in neuropsychiatric disorders.
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