Classification of Positive and Negative Stimuli Using EEG Data Functional Connectivity and Machine Learning

Bhamidipati, Sai Jaya Sasanka

Classification of Positive and Negative Stimuli Using EEG Data Functional Connectivity and Machine Learning

dc.contributor.advisor	Sakoglu, Unal
dc.contributor.committeeMember	Lu, Jiang
dc.contributor.committeeMember	Shih, Liwen
dc.creator	Bhamidipati, Sai Jaya Sasanka
dc.creator.orcid	0000-0002-8983-3070
dc.date.accessioned	2021-01-25T20:21:32Z
dc.date.available	2021-01-25T20:21:32Z
dc.date.created	2019-05
dc.date.issued	2019-12-06
dc.date.submitted	May 2019
dc.date.updated	2021-01-25T20:21:33Z
dc.description.abstract	Electroencephalography (EEG) provides electrical measures of brain activity by monitoring voltage fluctuations of the collective neural activity in different parts on the cortex of the brain. Recently, there have been numerous applications of machine learning techniques to classify events or participants based on EEG data in the biomedical field. EEG data are rich in the sense that one can extract many features from the data. This makes feature selection and reduction an important step in EEG based classification. Feature selection and correlations between features for classification of EEG data typically depend on time-frequency characteristics of the EEG channels, which represent data from different parts of the brain cortex. In this proposed work, we calculated functional connectivity (FC) between different EEG channels as our features for classification and applied it for classification of positive and negative visual stimuli. Previously, EEG data were collected from 12 participants (6 females and 6 males) while they were observing positive and negative images in a random order and the data were completely de-identified. After filtering of the noise in the data, we extracted FC features. From these FC features for each of the stimuli, we reduced the number of features using techniques which included correlation-based and principal components based methods. Once the features were selected, we implemented classification of positive vs. negative stimuli using classification techniques support vector machines, decision trees, random forests, k nearest neighbors, Gaussian process, Adaboost, quadratic discriminant analysis and logistic regression. We compared the classification accuracy results Support vector machine and Logistic regression provided the highest classification accuracy of whether a participant was seeing a positive or negative image, with accuracies of up to 71.9% and 71.4% for each of the participant, respectively.
dc.format.mimetype	application/pdf
dc.identifier.uri	https://hdl.handle.net/10657.1/2551
dc.language.iso	en
dc.subject	EEGLAB
dc.subject	Python
dc.subject	Weka
dc.subject	Machine Learning
dc.title	Classification of Positive and Negative Stimuli Using EEG Data Functional Connectivity and Machine Learning
dc.type	Thesis
dc.type.material	text
thesis.degree.grantor	University of Houston-Clear Lake
thesis.degree.level	Masters
thesis.degree.name	Master of Science