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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Differences in graph theory functional connectivity in left and right temporal lobe epilepsy.

Sharon Chiang1, John M Stern2, Jerome Engel3

  • 1Department of Statistics, Rice University, Houston, TX, USA.

Epilepsy Research
|December 3, 2014
PubMed
Summary

Functional connectivity in the limbic system is reduced in temporal lobe epilepsy (TLE), with more significant changes in right TLE. Left TLE shows reorganization, suggesting lateralized differences in epilepsy network dynamics.

Keywords:
Brain imagingEpilepsyFunctional MRIFunctional reorganizationGraph theory

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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Functional Neuroimaging

Background:

  • Temporal lobe epilepsy (TLE) is a common neurological disorder characterized by recurrent seizures originating in the temporal lobe.
  • Understanding the underlying network alterations in TLE is crucial for improving diagnosis and treatment.
  • Limbic system dysfunction is implicated in TLE, but lateralized differences in functional connectivity remain incompletely understood.

Purpose of the Study:

  • To investigate lateralized differences in limbic system functional connectivity between left and right temporal lobe epilepsy (TLE) using graph theory.
  • To compare network topology and regional connectivity patterns in patients with left TLE, right TLE, and healthy controls.

Main Methods:

  • Interictal resting-state functional magnetic resonance imaging (fMRI) data were acquired from patients with left TLE (n=14), right TLE (n=11), and healthy controls (n=12).
  • Graph theory analysis was applied to functional connectivity data from 10 bilateral limbic regions of interest.
  • Quantification of edgewise functional connectivity, network topology, and regional topology was performed to identify group differences.

Main Results:

  • Limbic functional connectivity was predominantly reduced in both left and right TLE compared to controls.
  • Right TLE exhibited more widespread reductions in regional connections, particularly interhemispheric connectivity involving the insula and hippocampi.
  • Left TLE showed a trend towards increased limbic connections and topological reorganization, including altered hippocampal betweenness centrality.

Conclusions:

  • Limbic functional connectivity is generally reduced in TLE, with more pronounced deficits in right TLE.
  • Left TLE displays distinct patterns of network reorganization, suggesting lateralized compensatory mechanisms.
  • Lateralized network differences in TLE may hold significant implications for clinical diagnosis and prognosis.