Magnetoencephalographic Microstates Reveal Disrupted Brain Activity Patterns in Schizophrenia Controlling for...

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Electroencephalography (EEG) and magnetoencephalography (MEG) microstates reflect large-scale brain circuit activity.
• Altered EEG microstates are linked to cognitive control deficits in schizophrenia (SCZ).
• MEG microstates (mMSs) offer source detection advantages but are underexplored in psychiatric disorders.

Purpose of the Study:

• To characterize MEG microstates (mMSs) in SCZ, bipolar disorder (BD), and major depressive disorder (MDD).
• To investigate treatment-related modulations of mMSs.
• To identify mMS anomalies associated with cognitive dysfunction in SCZ, controlling for medication effects.

Main Methods:

• Studied mMSs in a large cohort of controls, SCZ, BD, and MDD patients.
• Assessed treatment effects, particularly benzodiazepines.
• Analyzed mMSs after removing treatment bias to explore disorder-specific anomalies.

Main Results:

• Benzodiazepines reduced mMS variance and duration, increasing occurrence.
• In SCZ (excluding benzodiazepine users), increased occipito-parietal and reduced fronto-temporal/centro-parietal mMS contributions were observed.
• Altered mMSs in SCZ correlated with impaired sensory processing and cognitive function generators.
• No significant mMS differences were found in BD or MDD patients.

Conclusions:

• MEG microstate disruptions are detected in SCZ, linked to sensory integration and cognitive brain regions.
• These SCZ-related mMS alterations are independent of pharmacological treatment.
• Significant mMS anomalies were not found in mood disorders (BD, MDD).