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No Access Submitted: 05 September 2007 Accepted: 29 July 2008 Published Online: 26 August 2008

Detection of seizure rhythmicity by recurrences

Chaos 18, 033124 (2008); https://doi.org/10.1063/1.2973817
Mary Ann F. Harrison1, a), Mark G. Frei2, b), and Ivan Osorio2,3, c)
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ABSTRACT
Epileptic seizures show a certain degree of rhythmicity, a feature of heuristic and practical interest. In this paper, we introduce a simple model of this type of behavior, and suggest a measure for detecting and quantifying it. To evaluate our method, we develop a set of test segments that incorporate rhythmicity features, and present results from the application of this measure to test segments. We then analyze electrocorticogram segments containing seizures, and present two examples. Finally, we discuss the similarity of our method to techniques for detecting unstable periodic orbits in chaotic time series.

ACKNOWLEDGMENTS

This work was supported by NIH under Grant No. 5R01NS046602-02.

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