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Related Concept Videos

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Related Experiment Video

Updated: Apr 12, 2026

Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Structural-functional coupling changes in temporal lobe epilepsy.

Sharon Chiang1, John M Stern2, Jerome Engel3

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

Brain Research
|May 12, 2015
PubMed
Summary
This summary is machine-generated.

Structural and functional connectivity (SC-FC) coupling is altered in temporal lobe epilepsy (TLE). Decreased SC-FC coupling in left TLE, and its increase with epilepsy duration, suggests it may be a sensitive biomarker for TLE.

Keywords:
ConnectomicsDiffusion tensor imagingElastic netFunctional magnetic resonance imagingLimbic networkTemporal lobe epilepsy

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Connectomics

Background:

  • Temporal lobe epilepsy (TLE) involves alterations in both structural connectivity (SC) and functional connectivity (FC).
  • The interplay between SC and FC in TLE remains poorly understood.
  • Understanding SC-FC coupling is crucial for characterizing TLE's complex network dynamics.

Purpose of the Study:

  • To investigate the relationship between SC and FC within the limbic network in TLE.
  • To examine how SC-FC coupling relates to epilepsy duration, regional brain changes, and disease laterality.
  • To determine if SC-FC coupling serves as a more sensitive biomarker for TLE than individual connectivity measures.

Main Methods:

  • Utilized functional connectivity MRI and diffusion tensor imaging to assess SC-FC coupling in 14 left TLE, 10 right TLE patients, and 11 healthy controls.
  • Constructed separate structural and functional networks, then calculated the correlation between SC and FC.
  • Employed elastic net regression to identify regional structural and functional changes associated with SC-FC coupling.

Main Results:

  • SC-FC coupling was reduced in left TLE compared to controls, with decreased FC in both left and right TLE, and reduced SC in left TLE.
  • Increased SC-FC coupling correlated with longer epilepsy duration.
  • Longer epilepsy duration was linked to structural loss in the fusiform and inferior frontal orbital gyrus (left TLE) and functional hub redistribution (right TLE).

Conclusions:

  • Decoupling of structural and functional networks in TLE is influenced by epilepsy duration and regional alterations.
  • Specific brain regions like the fusiform gyrus, inferior frontal orbital gyrus, posterior cingulate, and hippocampus are implicated.
  • SC-FC coupling may offer a more sensitive biomarker for TLE disease burden compared to single-modality imaging.