Detection of focal electroencephalogram signals using higher-order moments in EMD-TKEO domain
[摘要] Detection of epileptogenic focus based on electroencephalogram (EEG) signal screening is an important pre-surgical step to remove affected regions inside the human brain. Considering the fact above, in this work, a novel technique for detection of focal EEG signals is proposed using a combination of empirical mode decomposition (EMD) and Teager–Kaiser energy operator (TKEO). EEG signals belonging to focal (Fo) and non-focal (NFo) groups were at first decomposed into a set of intrinsic mode functions (IMFs) using EMD. Next, TKEO was applied on each IMF and two higher-order statistical moments namely skewness and kurtosis were extracted as features from TKEO of each IMF. The statistical significance of the selected features was evaluated using student's t -test and based on the statistical test, features from first three IMFs which show very high discriminative capability were selected as inputs to a support vector machine classifier for discrimination of Fo and NFo signals. It was observed that the classification accuracy of 92.65% is obtained in classifying EEG signals using a radial basis kernel function, which demonstrates the efficacy of proposed EMD-TKEO based feature extraction method for computer-based treatment of patients suffering from focal seizures.
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[效力级别] [学科分类] 肠胃与肝脏病学
[关键词] brain;support vector machines;electroencephalography;feature extraction;medical signal processing;medical disorders;medical signal detection;signal classification;focal electroencephalogram signals;higher-order moments;EMD-TKEO domain;epileptogenic focus;electroencephalogram signal screening;important pre-surgical step;human brain;empirical mode decomposition;Teager–Kaiser energy operator;nonfocal groups;intrinsic mode functions;IMF;higher-order statistical moments;focal seizures;proposed EMD-TKEO based feature extraction method;radial basis kernel function;support vector machine classifier;high discriminative capability;statistical test;statistical significance;kurtosis;skewness [时效性]
