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Classification of Brain Signal (EEG) Induced by Shape-Analogous Letter Perception

Bose, Rohit and Goh, Sim Kuan and Wong, Kian F and Thakor, Nitish and Bezerianos, Anastasios and Li, Junhua (2019) 'Classification of Brain Signal (EEG) Induced by Shape-Analogous Letter Perception.' Advanced Engineering Informatics, 42. ISSN 0954-1810

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Abstract

Visual perception of English letters involves different underlying brain processes including brain activity alteration in multiple frequency bands. However, shape analogous letters elicit brain activities which are not obviously distinct and it is therefore difficult to differentiate those activities. In order to address discriminative feasibility and classification performance of the perception of shape-analogous letters, we performed an experiment in where EEG signals were obtained from 20 subjects while they were perceiving shape analogous letters (i.e., ‘p’, ‘q’, ‘b’, and ‘d’). Spectral power densities from five typical frequency bands (i.e., delta, theta, alpha, beta and gamma) were extracted as features, which were then classified by either individual widely-used classifiers, namely k-Nearest Neighbors (kNN), Support Vector Machine (SVM), Linear Discriminant Analysis (LDA), Random Forest (RF) and AdaBoost (ADA), or an ensemble of some of them. The F-score was employed to select most discriminative features so that the dimension of features was reduced. The results showed that the RF achieved the highest accuracy of 74.1% in the case of multi-class classification. In the case of binary classification, the best performance (Accuracy 86.39%) was achieved by the RF classifier in terms of average accuracy across all possible pairs of the letters. In addition, we employed decision fusion strategy to exert complementary strengths of different classifiers. The results demonstrated that the performance was elevated from 74.10% to 76.63% for the multi-class classification and from 86.39% to 88.08% for the binary class classification.

Item Type: Article
Uncontrolled Keywords: Electroencephalography (EEG); Shape analogous letters; F-score; Support Vector Machine; Random Forest; k-Nearest Neighbors; Linear Discriminant Analysis; AdaBoost; Multi-class classification; Decision level fusion
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Elements
Date Deposited: 18 Oct 2019 13:28
Last Modified: 14 Oct 2020 01:00
URI: http://repository.essex.ac.uk/id/eprint/25571

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