Connective profiles and antagonism between dynamic and static connectivity underlying generalized epilepsy.

Area of Science:

• Neuroscience
• Medical Imaging
• Systems Biology

Background:

• Generalized epilepsy (GE) involves complex alterations in brain network dynamics.
• Understanding the interplay between static and dynamic functional connectivity (sFC/dFC) is crucial for epilepsy research.

Purpose of the Study:

• To characterize connective profiles and the coupling relationship between dFC and sFC in large-scale brain networks in patients with GE.
• To investigate differences in structural connectivity (SC) and functional connectivity (FC) between GE patients and healthy controls (HC).

Main Methods:

• Acquired functional, structural, and diffusion MRI data from 83 GE patients and 106 HC.
• Deconvolved resting-state BOLD time courses to neural time courses using blind hemodynamic deconvolution.
• Constructed SC, sFC, and dFC networks and evaluated dFC-sFC association using Network-level weighted correlation probability (NWCP).

Main Results:

• GE patients exhibited hypervariability and enhanced FC, with decreased SC in the subcortical network.
• The default mode network in GE showed increased dFC, weaker anatomical links, and altered sFC.
• The frontoparietal network displayed increased SC and predominantly increased sFC in GE patients.
• A significant decrease in the antagonism between dFC and sFC was observed in core epileptic networks of GE patients compared to HC.

Conclusions:

• Distinct connective profiles exist across different epileptic networks in GE.
• The study provides insights into epilepsy mechanisms by highlighting altered antagonism between dynamic and static functional connectivity.