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Distributions of Irritative Zones Are Related to Individual Alterations of Resting-State Networks in Focal Epilepsy

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  • Yinchen Song
  • Basavaraju G Sanganahalli
  • Fahmeed Hyder
  • Wei-Chiang Lin
  • Jorge J Riera

Abstract

Alterations in the connectivity patterns of the fMRI-based resting-state networks (RSNs) have been reported in several types of epilepsies. Evidence pointed out these alterations might be associated with the genesis and propagation of interictal epileptiform discharges (IEDs). IEDs also evoke blood-oxygen-level dependent (BOLD) responses, which have been used to delineate irritative zones during preoperative work-up. Therefore, one may expect a relationship between the topology of the IED-evoked BOLD response network and the altered spatial patterns of the RSNs. In this study, we used EEG recordings and fMRI data obtained simultaneously from a chronic model of focal epilepsy in Wistar rats to verify our hypothesis. We found that IED-evoked BOLD response networks comprise both cortical and subcortical structures with a rat-dependent topology. In all rats, IEDs evoke both activation and deactivation types of BOLD responses. Using a Granger causality method, we found that in many cases areas with BOLD deactivation have directed influences on areas with activation (p

Suggested Citation

  • Yinchen Song & Basavaraju G Sanganahalli & Fahmeed Hyder & Wei-Chiang Lin & Jorge J Riera, 2015. "Distributions of Irritative Zones Are Related to Individual Alterations of Resting-State Networks in Focal Epilepsy," PLOS ONE, Public Library of Science, vol. 10(7), pages 1-29, July.
    • Handle: RePEc:plo:pone00:0134352
    DOI: 10.1371/journal.pone.0134352
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    References listed on IDEAS

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    1. Eric van Diessen & Willemiek J E M Zweiphenning & Floor E Jansen & Cornelis J Stam & Kees P J Braun & Willem M Otte, 2014. "Brain Network Organization in Focal Epilepsy: A Systematic Review and Meta-Analysis," PLOS ONE, Public Library of Science, vol. 9(12), pages 1-21, December.
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