title: Online Epileptic Seizure Prediction Using Wavelet-Based Bi-Phase Correlation of Electrical Signals Tomography.
abstract: Considerable efforts have been made in order to predict seizures. Among these methods, the ones that quantify synchronization between brain areas, are the most important methods. However, to date, a practically acceptable result has not been reported. In this paper, we use a synchronization measurement method that is derived according to the ability of bi-spectrum in determining the nonlinear properties of a system. In this method, first, temporal variation of the bi-spectrum of different channels of electro cardiography (ECoG) signals are obtained via an extended wavelet-based time-frequency analysis method; then, to compare different channels, the bi-phase correlation measure is introduced. Since, in this way, the temporal variation of the amount of nonlinear coupling between brain regions, which have not been considered yet, are taken into account, results are more reliable than the conventional phase-synchronization measures. It is shown that, for 21 patients of FSPEEG database, bi-phase correlation can discriminate the pre-ictal and ictal states, with very low false positive rates (FPRs) (average: 0.078/h) and high sensitivity (100%). However, the proposed seizure predictor still cannot significantly overcome the random predictor for all patients.
authors.affiliation: Digital Signal Processing Research Lab, Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Vahabi
authors.affiliation: Digital Signal Processing Research Lab, Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: Rasoul
authors.initials: R
authors.lastname: Amirfattahi
authors.affiliation: Department of Electrical Engineering, Payame Noor University (PNU), Isfahan, Iran.|Medical Image and Signal Processing Research Center, Medical University of Isfahan, Isfahan, Iran.
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Shayegh
authors.affiliation: Department of Advanced Medical Technologies, Medical University of Isfahan, Isfahan, Iran.|Medical Image and Signal Processing Research Center, Medical University of Isfahan, Isfahan, Iran.
authors.forename: Fahimeh
authors.initials: F
authors.lastname: Ghassemi
mesh_terms: D000465:Algorithms; D000069280:Electrocorticography; D004827:Epilepsy / Q000175:diagnosis*; D006801:Humans; D017711:Nonlinear Dynamics; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted
keywords: Seizure prediction; bi-phase correlation; bi-spectrum wavelet analysis