NDLI: Joint Sparse Representation of Brain Activity Patterns Related to Perceptual and Cognitive Components of a Speech Comprehension Task

Content Provider	IEEE Xplore Digital Library
Author	Ramezani, M. Abolmaesumi, P. Marble, K. MacDonald, H. Johnsrude, I.
Copyright Year	2012
Abstract	Neurological disorders that affect brain structure, function and networks would substantially benefit from developing new techniques that combine multi-modal and/or multi-task information. Here, we propose a Joint Sparse Representation Analysis method to identify common information across different functional contrasts in data from an fMRI experiment. We evaluate the use of a sparse representation analysis method within a Fisher Linear Discriminant (FLD) classification to classify individuals as young or older, based only on functional activation patterns in a speech listening task. Sixteen young (age: 19-26) and 16 older (age: 57-73) adults were scanned while listening to noise and to sentences degraded with noise, half of which contained meaningful context which is known to enhance intelligibility. Functional contrast images representing different perceptual and cognitive components of speech perception (i.e., auditory perception; speech perception, use of context to enhance perception) were used within the joint sparse representation analysis to generate basis activation sources and their corresponding sparse modulation profiles. Sparse modulation profiles were used to classify individuals into the young and older categories. Results demonstrate that a combination of functional contrast images yielded excellent classification performance.
Starting Page	29
Ending Page	32
File Size	616795
Page Count	4
File Format	PDF
ISBN	9781467321822
DOI	10.1109/PRNI.2012.35
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-02
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Context Brain Dictionaries Noise Classification Speech Sparse matrices Joints Brain activity patterns Joint sparse representaion FMRI
Content Type	Text
Resource Type	Article

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