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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Abnormal default-mode network homogeneity in patients with temporal lobe epilepsy.

Yujun Gao1, Jinou Zheng, Yaping Li

  • 1Department of Neurology Department of Radiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China.

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|June 29, 2018
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Summary

Temporal lobe epilepsy (TLE) shows altered default-mode network (DMN) homogeneity. Findings reveal specific DMN changes in right TLE and left TLE, impacting cognitive function.

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Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Medical Imaging

Background:

  • The default-mode network (DMN) is crucial for cognitive functions often impaired in temporal lobe epilepsy (TLE).
  • Alterations in DMN network homogeneity (NH) in TLE remain poorly understood.

Purpose of the Study:

  • To investigate DMN network homogeneity (NH) alterations in patients with TLE using a resting-state functional magnetic resonance imaging (fMRI) approach.
  • To explore the relationship between DMN NH abnormalities and cognitive performance in TLE.

Main Methods:

  • Resting-state fMRI data were acquired from 47 TLE patients (29 right TLE, 18 left TLE) and 35 healthy controls.
  • Network homogeneity (NH) analysis was applied to assess DMN functional connectivity.
  • Cognitive performance, specifically reaction time, was evaluated.

Main Results:

  • Right TLE (rTLE) showed decreased NH in the right middle temporal pole gyrus and increased NH in the bilateral posterior cingulate cortex compared to controls.
  • Left TLE (lTLE) exhibited decreased NH in the left inferior temporal gyrus and left hippocampus.
  • Left TLE patients demonstrated longer performance reaction times; no significant correlation was found between NH values and clinical variables.

Conclusions:

  • Abnormal DMN network homogeneity is present in both right and left TLE.
  • These DMN alterations are significant in the pathophysiology of cognitive deficits associated with TLE.
  • Executive function abnormalities are also identified in left TLE.