The European Physical Journal Special Topics

, Volume 222, Issue 2, pp 569–585

Ordinal patterns in epileptic brains: Analysis of intracranial EEG and simultaneous EEG-fMRI

  • C. Rummel
  • E. Abela
  • M. Hauf
  • R. Wiest
  • K. Schindler
Regular Article Applications to Real World Time Series
  • 148 Downloads

Abstract

Epileptic seizures are associated with high behavioral stereotypy of the patients. In the EEG of epilepsy patients characteristic signal patterns can be found during and between seizures. Here we use ordinal patterns to analyze EEGs of epilepsy patients and quantify the degree of signal determinism. Besides relative signal redundancy and the fraction of forbidden patterns we introduce the fraction of under-represented patterns as a new measure. Using the logistic map, parameter scans are performed to explore the sensitivity of the measures to signal determinism. Thereafter, application is made to two types of EEGs recorded in two epilepsy patients. Intracranial EEG shows pronounced determinism peaks during seizures. Finally, we demonstrate that ordinal patterns may be useful for improving analysis of non-invasive simultaneous EEG-fMRI.

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Copyright information

© EDP Sciences and Springer 2013

Authors and Affiliations

  • C. Rummel
    • 1
  • E. Abela
    • 1
    • 2
  • M. Hauf
    • 1
    • 3
  • R. Wiest
    • 1
  • K. Schindler
    • 2
  1. 1.Support Center for Advanced Neuroimaging, University Institute for Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital and University of BernBernSwitzerland
  2. 2.Department of NeurologyInselspital, Bern University Hospital and University of BernBernSwitzerland
  3. 3.Klinik Bethesda TschuggBernSwitzerland

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