Frequency-specific changes in the default mode network in patients with cingulate gyrus epilepsy.

Area of Science:

• Neuroscience
• Epilepsy Research
• Brain Connectivity

Background:

• The default mode network (DMN) is crucial for cognitive functions.
• Understanding DMN alterations in cingulate gyrus epilepsy (CGE) is vital for identifying biomarkers.
• Previous research has not fully elucidated DMN functional connectivity in CGE.

Purpose of the Study:

• To investigate abnormal functional connectivity within the DMN in patients with CGE.
• To explore potential new biomarkers for CGE based on DMN activity.
• To analyze frequency-specific oscillations (alpha, beta, gamma) in DMN connectivity.

Main Methods:

• Magnetoencephalography (MEG) was used to study 15 CGE patients and 15 healthy controls at rest.
• Twelve DMN brain areas were analyzed for functional connectivity.
• Multifrequency signals (alpha, beta, gamma bands) were investigated.

Main Results:

• Patients with CGE exhibited significantly greater functional connectivity in all three frequency bands (alpha, beta, gamma) compared to controls.
• Elevated functional connectivity in the gamma band was more pronounced than in alpha and beta bands.
• Significant differences in connectivity between the left angular gyrus and left posterior cingulate cortex were observed across all frequency bands.

Conclusions:

• Altered functional connectivity, particularly in the gamma band, plays a key role in the DMN of CGE.
• Abnormal connectivity between the left angular gyrus and left posterior cingulate cortex may serve as a novel biomarker for CGE.