EEG signal classification using wavelet feature extraction and a mixture of expert model

Authors:
Abdulhamit Subasi
Affiliations:
Department of Electrical and Electronics Engineering, Kahramanmaras Sutcu Imam University, Avsar Yerleskesi, 46050-9 Kahramanmaraş, Turkey
Venue:
Expert Systems with Applications: An International Journal
Year:
2007

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Abstract

Mixture of experts (ME) is modular neural network architecture for supervised learning. A double-loop Expectation-Maximization (EM) algorithm has been introduced to the ME network structure for detection of epileptic seizure. The detection of epileptiform discharges in the EEG is an important component in the diagnosis of epilepsy. EEG signals were decomposed into the frequency sub-bands using discrete wavelet transform (DWT). Then these sub-band frequencies were used as an input to a ME network with two discrete outputs: normal and epileptic. In order to improve accuracy, the outputs of expert networks were combined according to a set of local weights called the ''gating function''. The invariant transformations of the ME probability density functions include the permutations of the expert labels and the translations of the parameters in the gating functions. The performance of the proposed model was evaluated in terms of classification accuracies and the results confirmed that the proposed ME network structure has some potential in detecting epileptic seizures. The ME network structure achieved accuracy rates which were higher than that of the stand-alone neural network model.