Whole-Brain Source-Reconstructed MEG-Data Reveal Reduced Long-Range Synchronization in Chronic Schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Schizophrenia (ScZ) is theorized to stem from a "dysconnection syndrome."
• Empirical evidence using physiological data at realistic timescales remains limited.
• Investigating large-scale neural synchronization is crucial for understanding ScZ pathophysiology.

Purpose of the Study:

• To investigate alterations in large-scale neural synchronization in chronic schizophrenia patients.
• To test the dysconnection syndrome hypothesis using Magnetoencephalography (MEG).
• To correlate synchronization deficits with clinical symptoms and cognitive function.

Main Methods:

• Utilized Magnetoencephalography (MEG) on 16 chronic schizophrenia patients and 19 healthy controls.
• Employed data-driven analyses of neuronal synchronization on source-reconstructed MEG data.
• Estimated oscillation amplitudes and interareal phase-synchronization (3-120 Hz) across 400 cortical parcels.

Main Results:

• Schizophrenia patients exhibited reduced gamma-band (30-120 Hz) oscillation amplitudes.
• A significant deficit in large-scale gamma-band synchronization was observed in ScZ patients.
• Reduced synchronization within visual regions and between visual and frontal cortices was found.
• Decreased synchronization correlated with increased clinical disorganization scores.

Conclusions:

• Schizophrenia is associated with a profound disruption of transient neural synchronization.
• These findings provide critical support for impaired coordination of distributed neural activity in ScZ pathophysiology.
• The study highlights the role of the dysconnection syndrome in schizophrenia.