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Evolutionary Design of EEG Data Classifier
Kuželová, Simona ; Jawed, Soyiba (oponent) ; Mrázek, Vojtěch (vedoucí práce)
This thesis focuses on developing an effective classifier for candidate classification based on a set of extracted Electroencephalography (EEG) signal features. To achieve this, a genetic algorithm was utilized for feature selection and optimalization of the classifier’s parameters based on five criteria: minimizing the number of features, minimizing inference time, and maximizing classification sensitivity, specificity, and accuracy. The eyes opened EEG data of 31 candidates suffering from Major Depressive Disorder (MDD) and 28 healthy candidates were used for feature extraction, with the goal of classifying candidates as either having MDD or being healthy. Two algorithms, NSGA-II and NSGA-III, were tested. The proposed algorithm operated with three criteria, but two additional criteria, sensitivity and specificity, were added. NSGA-III was more effective in this case and was used in the remaining experiments. Constraints were introduced to improve performance, and different values for the mutation and crossover probability were tried. The classifiers from the final result have an average accuracy of $91.36\%$, sensitivity of $91.82\%$, and specificity of $90.84\%$. In the final experiments most frequently used channels were F3 and C3 channels and most commonly utilized waveband was gamma waveband. Overall, this work presents effective classifiers that were obtained using the proposed algorithm, which utilizes a genetic algorithm for parameter optimization.
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