Network analysis of the default mode network using functional connectivity MRI in Temporal Lobe Epilepsy

Area of Science:

• Neuroimaging
• Epilepsy Research
• Brain Connectivity

Background:

• Temporal Lobe Epilepsy (TLE) is a common neurological disorder affecting brain networks.
• The default mode network (DMN) is crucial for resting-state cognition and may be impacted in TLE.
• Functional connectivity MRI (fcMRI) measures brain region synchronization via BOLD signal correlations.

Purpose of the Study:

• To investigate alterations in the DMN using seed-based fcMRI in Temporal Lobe Epilepsy.
• To examine the connectivity between anterior and posterior DMN hubs in TLE patients.
• To identify differential DMN connectivity patterns in left versus right TLE.

Main Methods:

• Seed-based functional connectivity MRI (fcMRI) analysis was employed.
• The anterior and posterior hubs of the default mode network (DMN) served as seeds.
• BOLD signal fluctuations were analyzed to determine functional connectivity.

Main Results:

• A significant disconnection was observed between the anterior and posterior DMN hubs in TLE during basal states.
• Left TLE showed increased DMN connectivity to other brain regions.
• Right TLE exhibited decreased DMN connectivity to other brain regions.

Conclusions:

• Seed-based fcMRI effectively probes cerebral network alterations in TLE.
• TLE is associated with disrupted DMN connectivity, with lateralized differences observed.
• These findings contribute to understanding the neurobiological underpinnings of TLE.