Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman

Regardless of type of stress, either mental stress, emotional stress or physical stress, it definitely affects human lifestyle and work performance. There are two prominent methods in assessing stress which are psychological assessment (qualitative method) and physiological assessment (quantitative...

Full description

Saved in:
Bibliographic Details
Main Author: Sulaiman, Norizam
Format: Thesis
Language:English
Published: 2015
Subjects:
Online Access:https://ir.uitm.edu.my/id/eprint/27909/1/TP_NORIZAM%20SULAIMAN%20EE%2015_5.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
id my-uitm-ir.27909
record_format uketd_dc
spelling my-uitm-ir.279092020-01-30T03:34:46Z Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman 2015 Sulaiman, Norizam Electric controllers. Rheostats. Regulators. Starters Regardless of type of stress, either mental stress, emotional stress or physical stress, it definitely affects human lifestyle and work performance. There are two prominent methods in assessing stress which are psychological assessment (qualitative method) and physiological assessment (quantitative method). This research proposes a new stress index based on Electroencephalogram (EEG) signals and non-parametric analysis of the signals. In non-parametric method, the EEG features that might relate to stress are extracted in term of Asymmetry Ratio (AR), Relative Energy Ratio (RER), Spectral Centroids (SC) and Spectral Entropy (SE). The selected features are fed to the k-Nearest Neighbor (k-NN) classifier to identify the stressed group among the four experimental groups being tested. The classification results are based on accuracy, sensitivity and specificity. To support the classification results using k-NN classifier, the clustering techniques using Fuzzy C-Means (FCM) and Fuzzy K-Means (FKM) are implemented. To ensure the robustness of the classifier, the cross validation technique using k-fold and leave-one-out is performed to the classifier. The assignment of the stress index is verified by applying Z-score technique to the selected EEG features. The experiments established a 3-level index (Index 1, Index 2 and Index 3) which represents the stress levels of low stress, moderate stress and high stress at overall classification accuracy of 88.89%, classification sensitivity of 86.67 % and classification specificity of 100%. The outcome of the research suggests that the stress level of human can be determined accurately by applying SC on the ratio of the Energy Spectral Density (ESD) of Beta and Alpha bands of the brain signals. The experimental results of this study also confirm that human stress level can be determined and classified precisely using physiological signal through the proposed stress index. The high accuracy, sensitivity and specificity of the classifier might also indicate the robustness of the proposed method. 2015 Thesis https://ir.uitm.edu.my/id/eprint/27909/ https://ir.uitm.edu.my/id/eprint/27909/1/TP_NORIZAM%20SULAIMAN%20EE%2015_5.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Electrical Engineering
institution Universiti Teknologi MARA
collection UiTM Institutional Repository
language English
topic Electric controllers
Rheostats
Regulators
Starters
spellingShingle Electric controllers
Rheostats
Regulators
Starters
Sulaiman, Norizam
Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman
description Regardless of type of stress, either mental stress, emotional stress or physical stress, it definitely affects human lifestyle and work performance. There are two prominent methods in assessing stress which are psychological assessment (qualitative method) and physiological assessment (quantitative method). This research proposes a new stress index based on Electroencephalogram (EEG) signals and non-parametric analysis of the signals. In non-parametric method, the EEG features that might relate to stress are extracted in term of Asymmetry Ratio (AR), Relative Energy Ratio (RER), Spectral Centroids (SC) and Spectral Entropy (SE). The selected features are fed to the k-Nearest Neighbor (k-NN) classifier to identify the stressed group among the four experimental groups being tested. The classification results are based on accuracy, sensitivity and specificity. To support the classification results using k-NN classifier, the clustering techniques using Fuzzy C-Means (FCM) and Fuzzy K-Means (FKM) are implemented. To ensure the robustness of the classifier, the cross validation technique using k-fold and leave-one-out is performed to the classifier. The assignment of the stress index is verified by applying Z-score technique to the selected EEG features. The experiments established a 3-level index (Index 1, Index 2 and Index 3) which represents the stress levels of low stress, moderate stress and high stress at overall classification accuracy of 88.89%, classification sensitivity of 86.67 % and classification specificity of 100%. The outcome of the research suggests that the stress level of human can be determined accurately by applying SC on the ratio of the Energy Spectral Density (ESD) of Beta and Alpha bands of the brain signals. The experimental results of this study also confirm that human stress level can be determined and classified precisely using physiological signal through the proposed stress index. The high accuracy, sensitivity and specificity of the classifier might also indicate the robustness of the proposed method.
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Sulaiman, Norizam
author_facet Sulaiman, Norizam
author_sort Sulaiman, Norizam
title Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman
title_short Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman
title_full Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman
title_fullStr Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman
title_full_unstemmed Determination and classification of human stress index using nonparametric analysis of EEG signals / Norizam Sulaiman
title_sort determination and classification of human stress index using nonparametric analysis of eeg signals / norizam sulaiman
granting_institution Universiti Teknologi MARA
granting_department Faculty of Electrical Engineering
publishDate 2015
url https://ir.uitm.edu.my/id/eprint/27909/1/TP_NORIZAM%20SULAIMAN%20EE%2015_5.pdf
_version_ 1783734025701031936