Information-Theoretic based feature selection for multi-voxel pattern analysis of fMRI data

Authors:
Chun-An Chou;Kittipat Kampa;Sonya H. Mehta;Rosalia F. Tungaraza;W. Art Chaovalitwongse;Thomas J. Grabowski
Affiliations:
Integrated Brain Imaging Center, University of Washington, Seattle and Industrial & Systems Engineering, University of Washington, Seattle;Integrated Brain Imaging Center, University of Washington, Seattle and Industrial & Systems Engineering, University of Washington, Seattle;Integrated Brain Imaging Center, University of Washington, Seattle and Psychology, University of Washington, Seattle and Radiology, University of Washington, Seattle;Integrated Brain Imaging Center, University of Washington, Seattle and Radiology, University of Washington, Seattle;Integrated Brain Imaging Center, University of Washington, Seattle and Industrial & Systems Engineering, University of Washington, Seattle and Radiology, University of Washington, Seattle;Integrated Brain Imaging Center, University of Washington, Seattle and Neurology, University of Washington, Seattle, and Radiology, University of Washington, Seattle
Venue:
BI'12 Proceedings of the 2012 international conference on Brain Informatics
Year:
2012

Citing 5
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Abstract

Multi-voxel pattern analysis (MVPA) of functional magnetic resonance imaging (fMRI) data is an emerging approach for probing the neural correlates of cognition. MVPA allows cognitive representations and processing to be modeled as distributed patterns of neural activity, which can be used to build a classification model to partition activity patterns according to stimulus conditions. In machine learning, MVPA is a very challenging classification problem because the number of voxels (features) greatly exceeds the number of data instances. Thus, there is a need to select informative voxels before building a classification model. We introduce a feature selection method based on mutual information (MI), which is used to quantify the statistical dependency between features and stimulus conditions. To evaluate the utility of our approach, we employed several linear classification algorithms on a publicly available fMRI data set that has been widely used to benchmark MVPA performance [1]. The computational results suggest that feature selection based on the MI ranking can drastically improve the classification accuracy. Additionally, high-ranked features provide meaningful insights into the functional-anatomic relationship of neural activity and the associated tasks.