PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

GLM and SVM Analyses of Neural Response to Tonal and Atonal Stimuli: New Techniques and A Comparison
Simon Durrant, David Hardoon, Andre Brechmann, John Shawe-Taylor, Edurado Miranda and Henning Scheich
Connection Science, Special Issue on Music, Brain & Cognition 2008.

Abstract

This paper gives both general linear model (GLM) and support vector machine (SVM) analyses of an experiment concerned with tonality in music. The two forms of analysis are both contrasted and used to complement each other, and a new technique employing the GLM as a pre-processing step for the SVM is presented. The SVM is given the task of classifying the stimulus conditions (tonal or atonal) on the basis of the blood oxygen level-dependent signal of novel data, and the prediction performance is evaluated. In addition, a more detailed assessment of the SVM performance is given in a comparison of the similarity in the identification of voxels relevant to the classification of the SVM and a GLM. A high level of similarity between SVM weight and GLM t-maps demonstrate that the SVM is successfully identifying relevant voxels, and it is this that allows it to perform well in the classification task in spite of very noisy data and stimuli that involve higher-order cognitive functions and considerably inter-subject variation in neural response.

EPrint Type:Article
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Brain Computer Interfaces
ID Code:4664
Deposited By:David Hardoon
Deposited On:13 March 2009