Detection of seizures from small samples using nonlinear dynamic system theory

Ilker Yaylali, Hüseyin Koçak, Prasanna Jayakar

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


The electroencephalogram (EEG), like many other biological phenomena, is quite likely governed by nonlinear dynamics. Certain characteristics of the underlying dynamics have recently been quantified by computing the correlation dimensions (D2) of EEG time series data. In this paper, D2 of the unbiased autocovariance function of the scalp EEG data was used to detect electrographic seizure activity. Digital EEG data were acquired at a sampling rate of 200 Hz per channel and organized in continuous frames (duration 2.56 s, 512 data points). To increase the reliability of D2 computations with short duration data, raw EEG data were initially simplified using unbiased autocovariance analysis to highlight the periodic activity that is present during seizures. The D2 computation was then performed from the unbiased autocovariance function of each channel using the Grassberger-Procaccia method with Theiler's box-assisted correlation algorithm. Even with short duration data, this preprocessing proved to be computationally robust and displayed no significant sensitivity to implementation details such as the choices of embedding dimension and box size. The system successfully identified various types of seizures in clinical studies.

Original languageEnglish (US)
Pages (from-to)743-751
Number of pages9
JournalIEEE Transactions on Biomedical Engineering
Issue number7
StatePublished - Jul 1996

ASJC Scopus subject areas

  • Biomedical Engineering


Dive into the research topics of 'Detection of seizures from small samples using nonlinear dynamic system theory'. Together they form a unique fingerprint.

Cite this