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Single- and Multiple-Event Paradigms for Identification of Motor Cortex Activation

Michael Marquarta, Rasmus Birna and Victor HaughtonGo,a

a From the Departments of Radiology (M.M., V.M.H.) and Biophysics Research Institute (R.M.B.), Medical College of Wisconsin, Milwaukee, WI.



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  		FIG 1. Comparison of the block-design method and the single-event method for one participant.

A, Analyzed by the block-design method, the finger task shows activation in the sensorimotor cortex and (in an adjacent section that is not illustrated) in the midline in the presumed SMA.

B, Analyzed by the single-event method, the finger task shows activation in the sensorimotor cortex, SMA, and parietal and frontal lobes, which was classified as nonspecific in this study.

C, Analyzed by the block-design method, the tongue task shows activation in the inferior sensorimotor cortex on the convexity and in the SMA in the midline. Activation along the inner table over the left parietal lobe is likely motion artifact.

D, Analyzed by the single-event method, the tongue task produces activation in the SMA and sensorimotor cortex and in frontal and parietal regions. The motion artifact is less evident.



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  		FIG 2. Average number of activated pixels within the sensorimotor cortex and SMA and outside these regions for each task and each analysis method



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  		FIG 3. Percentage of activated pixels in the sensorimotor cortex region, in the SMA, and outside of these two areas





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X