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

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  • Applications to Real World Time Series
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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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Authors and Affiliations

  1. Support Center for Advanced Neuroimaging, University Institute for Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland

    C. Rummel, E. Abela, M. Hauf & R. Wiest

  2. Department of Neurology, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland

    E. Abela & K. Schindler

  3. Klinik Bethesda Tschugg, Bern, Switzerland

    M. Hauf

Authors
  1. C. Rummel
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  2. E. Abela
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  3. M. Hauf
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  4. R. Wiest
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  5. K. Schindler
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Correspondence to C. Rummel.

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Rummel, C., Abela, E., Hauf, M. et al. Ordinal patterns in epileptic brains: Analysis of intracranial EEG and simultaneous EEG-fMRI. Eur. Phys. J. Spec. Top. 222, 569–585 (2013). https://doi.org/10.1140/epjst/e2013-01860-9

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  • DOI: https://doi.org/10.1140/epjst/e2013-01860-9

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