Pattern recognition of spectral entropy features for detection of alcoholic and control visual ERP’s in multichannel EEGs

Padmashree, T K and Sriraam, N (2017) Pattern recognition of spectral entropy features for detection of alcoholic and control visual ERP’s in multichannel EEGs. Brain Informatics, 4 (2). pp. 147-158. ISSN 2198-4018

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Abstract

This paper presents a novel ranking method to select spectral entropy (SE) features that discriminate alcoholic and control visual event-related potentials (ERP’S) in gamma sub-band (30–55 Hz) derived from a 64-channel electroencephalogram (EEG) recording. The ranking is based on a t test statistic that rejects the null hypothesis that the group means of SE values in alcoholics and controls are identical. The SE features with high ranks are indicative of maximal separation between their group means. Various sizes of top ranked feature subsets are evaluated by applying principal component analysis (PCA) and k-nearest neighbor (k-NN) classification. Even though ranking does not influence the performance of classifier significantly with the selection of all 61 active channels, the classification efficiency is directly proportional to the number of principal components (pc). The effect of ranking and PCA on classification is predominantly observed with reduced feature subsets of (N = 25, 15) top ranked features. Results indicate that for N = 25, proposed ranking method improves the k-NN classification accuracy from 91 to 93.87% as the number of pcs increases from 5 to 25. With same number of pcs, the k-NN classifier responds with accuracies of 84.42–91.54% with non-ranked features.

Item Type: Article
Uncontrolled Keywords: Visual event-related potentials (visual ERP) � Electroencephalogram (EEG) � Spectral entropy (SE) � Gamma sub-band � Principal component analysis (PCA) � Principal components (pcs) � k-Nearest neighbor (k-NN) classifier
Subjects: Engineering > MIT Manipal > Electronics and Communication
Depositing User: MIT Library
Date Deposited: 28 Aug 2017 08:47
Last Modified: 28 Aug 2017 08:47
URI: http://eprints.manipal.edu/id/eprint/149590

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