Identifying EEG Connections Associated with the Balance Between Alpha Functional Connectivity and Small-Worldness

Area of Science:

• Neuroscience
• Brain Network Organization
• Computational Neuroscience

Background:

• Functional connectivity and small-worldness are key metrics for understanding brain network organization.
• Previous research indicates a negative correlation between these measures in the alpha frequency band.

Purpose of the Study:

• To investigate how specific electroencephalography (EEG) alpha-band connections influence the balance between functional connectivity and small-worldness.
• To explore the relationship between these network properties and the default mode network (DMN).

Main Methods:

• Recorded resting-state EEG from 80 healthy subjects (eyes-closed).
• Estimated functional connectivity using magnitude-squared coherence (MSC), imaginary part of coherency (ICOH), and synchronization likelihood (SL).
• Calculated small-worldness for each functional connectivity measure.

Main Results:

• Identified a significant negative correlation between functional connectivity and small-worldness.
• Observed the strongest negative correlation in frontal-occipital and frontal connections.
• These findings suggest a potential link to default mode network (DMN) activity.

Conclusions:

• The study highlights a balance between functional network structure and connectivity in the resting brain.
• Provides insights into the maintenance of functional organization in resting-state networks.
• Suggests future research directions in cognitive tasks and neurological disorders.