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Correlation between language organization and diffusion tensor abnormalities in refractory partial epilepsy.

Regula S Briellmann1, L Anne Mitchell, Anthony B Waites

  • 1Brain Research Institute, University of Melbourne, Austin and Repatriation Medical Centre, Repatriation Campus, Heidelberg West 3081, Victoria, Australia.

Epilepsia
|November 26, 2003
PubMed
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Atypical language organization in epilepsy patients may stem from white-matter tract changes. This study links language lateralization index (LI) and diffusion tensor imaging (DTI) abnormalities in the temporal lobe.

Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Neurology

Background:

  • Atypical language organization is common in refractory partial epilepsy.
  • The underlying causes of altered language lateralization in epilepsy are not fully understood.

Purpose of the Study:

  • To investigate the relationship between language laterality index (LI) and white-matter tract integrity in patients with refractory partial epilepsy.
  • To explore if white-matter changes correlate with atypical language organization.

Main Methods:

  • Nine patients with refractory partial epilepsy underwent 3-Tesla MRI.
  • Functional MRI (fMRI) assessed language processing using a noun-verb generation task.
  • Diffusion Tensor Imaging (DTI) evaluated white-matter integrity in frontal, temporal, and parietal lobes.

Related Experiment Videos

Main Results:

  • Two patients exhibited atypical language lateralization (LI < 0.4).
  • Both patients with atypical language also showed left temporal white-matter DTI asymmetry.
  • A significant correlation was found between temporal lobe DTI asymmetry and the language laterality index (r=0.8, p=0.006).

Conclusions:

  • Atypical language lateralization in partial epilepsy patients may be associated with white-matter tract abnormalities.
  • DTI-derived white-matter asymmetry, particularly in the temporal lobe, is linked to altered language organization in epilepsy.