NDLI: Study on Detection of Epileptic Discharges Based on a Duffing Oscillator Model

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Murakami, Takahiro Ukida, Yasumi Fujii, Masami Suzuki, Michiyasu Saito, Takashi
Copyright Year	2014
Abstract	In order to establish a quantitative detection method for appearance in epileptic discharges (EDs), we propose using the model parameters in a Duffing oscillator, which is a nonlinear mathematical model. Extracting four frequency bands of delta, theta, alpha and beta waves from the time history of the electrocorticogram (ECoG) obtained from rats with induced EDs, we applied a sweep window to the time history for each band. So as to fit the equation for the Duffing oscillator to the time history of the ECoG, we used the least square method to determine the model parameters expressing characteristics of ECoG. The Duffing oscillator has three kinds of vibrational parameters and four kinds of parameters about the amplitude for the driving force with two predominant frequencies contained in ECoG. In order to examine the appearance time of the EDs and the change of ECoG characteristics, we determined the model parameters for each sweep window. When epilepsy occurs, we found that the amount of the parameters related to “conservation”, “dissipation” and “input quantities” increases. On the other hand, the parameter value corresponding to nonlinearity tends to decrease. It is found that the proposed method by the model parameters of the Duffing oscillator can be used in quantitative detection for EDs.
File Format	PDF
ISBN	9780791846469
DOI	10.1115/IMECE2014-38107
Volume Number	Volume 3: Biomedical and Biotechnology Engineering
Conference Proceedings	ASME 2014 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2014-11-14
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Energy dissipation Waves Electromagnetic spectrum
Content Type	Text
Resource Type	Article

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