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J Neurophysiol 89: 989-1002, 2003; doi:10.1152/jn.00132.2002
0022-3077/03 $5.00
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J Neurophysiol (February 1, 2003). 10.1152/jn.00132.2002
Submitted on Submitted 22 February 2002; accepted in final form 7 October 2002

Functional Properties of Brain Areas Associated With Motor Execution and Imagery

Takashi Hanakawa,1 Ilka Immisch,1 Keiichiro Toma,1 Michael A. Dimyan,1 Peter Van Gelderen,2 and Mark Hallett1

 1Human Motor Control Section, Medical Neurology Branch and  2Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892

Hanakawa, Takashi, Ilka Immisch, Keiichiro Toma, Michael A. Dimyan, Peter Van Gelderen, and Mark Hallett. Functional Properties of Brain Areas Associated With Motor Execution and Imagery. J. Neurophysiol. 89: 989-1002, 2003. Imagining motor acts is a cognitive task that engages parts of the executive motor system. While motor imagery has been intensively studied using neuroimaging techniques, most studies lack behavioral observations. Here, we used functional MRI to compare the functional neuroanatomy of motor execution and imagery using a task that objectively assesses imagery performance. With surface electromyographic monitoring within a scanner, 10 healthy subjects performed sequential finger-tapping movements according to visually presented number stimuli in either a movement or an imagery mode of performance. We also examined effects of varied and fixed stimulus types that differ in stimulus dependency of the task. Statistical parametric mapping revealed movement-predominant activity, imagery-predominant activity, and activity common to both movement and imagery modes of performance (movement-and-imagery activity). The movement-predominant activity included the primary sensory and motor areas, parietal operculum, and anterior cerebellum that had little imagery-related activity (-0.1 ~ 0.1%), and the caudal premotor areas and area 5 that had mild-to-moderate imagery-related activity (0.2 ~ 0.7%). Many frontoparietal areas and posterior cerebellum demonstrated movement-and-imagery activity. Imagery-predominant areas included the precentral sulcus at the level of middle frontal gyrus and the posterior superior parietal cortex/precuneus. Moreover, activity of the superior precentral sulcus and intraparietal sulcus areas, predominantly on the left, was associated with accuracy of the imagery task performance. Activity of the inferior precentral sulcus (area 6/44) showed stimulus-type effect particularly for the imagery mode. A time-course analysis of activity suggested a functional gradient, which was characterized by a more "executive" or more "imaginative" property in many areas related to movement and/or imagery. The results from the present study provide new insights into the functional neuroanatomy of motor imagery, including the effects of imagery performance and stimulus-dependency on brain activity.




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