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The Journal of Neuroscience, February 28, 2007, 27(9):2424-2432; doi:10.1523/JNEUROSCI.3886-06.2007
 Previous Article
Behavioral/Systems/Cognitive
Spectral Changes in Cortical Surface Potentials during Motor Movement
Kai J. Miller,1
Eric C. Leuthardt,2
Gerwin Schalk,6
Rajesh P. N. Rao,3
Nicholas R. Anderson,7
Daniel W. Moran,7
John W. Miller,4,5 and
Jeffrey G. Ojemann2,5
1Departments of Physics, 2Neurological Surgery, 3Computer Science and Engineering, and 4Neurology and 5Harborview Regional Epilepsy Center, University of Washington, Seattle, Washington 98195, 6Wadsworth Center, New York State Department of Health, Albany, New York 12201, and 7Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130
Correspondence should be addressed to Kai J. Miller, University of Washington, Department of Physics, Box 351560, Seattle, WA 98195-1560. Email: kjmiller{at}u.washington.edu
In the first large study of its kind, we quantified changes in electrocorticographic signals associated with motor movement across 22 subjects with subdural electrode arrays placed for identification of seizure foci. Patients underwent a 5–7 d monitoring period with array placement, before seizure focus resection, and during this time they participated in the study. An interval-based motor-repetition task produced consistent and quantifiable spectral shifts that were mapped on a Talairach-standardized template cortex. Maps were created independently for a high-frequency band (HFB) (76–100 Hz) and a low-frequency band (LFB) (8–32 Hz) for several different movement modalities in each subject. The power in relevant electrodes consistently decreased in the LFB with movement, whereas the power in the HFB consistently increased. In addition, the HFB changes were more focal than the LFB changes. Sites of power changes corresponded to stereotactic locations in sensorimotor cortex and to the results of individual clinical electrical cortical mapping. Sensorimotor representation was found to be somatotopic, localized in stereotactic space to rolandic cortex, and typically followed the classic homunculus with limited extrarolandic representation.
Key words: electrocorticography (ECoG); motor; mapping; somatotopy; homunculus; cortical spectra
Received Sept. 7, 2006;
revised Jan. 16, 2007;
accepted Jan. 18, 2007.
Correspondence should be addressed to Kai J. Miller, University of Washington, Department of Physics, Box 351560, Seattle, WA 98195-1560. Email: kjmiller{at}u.washington.edu
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