Journal
NEUROIMAGE
Volume 13, Issue 6, Pages 1027-1034Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/nimg.2001.0776
Keywords
cortical topography; functional magnetic resonance imaging; cerebral cortex; voluntary hand movement
Funding
- NIA NIH HHS [AG10634] Funding Source: Medline
- NINDS NIH HHS [NS35376] Funding Source: Medline
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We used functional magnetic resonance imaging to examine the representation pattern for repetitive voluntary finger movements in the primary motor cortex (M1) and the supplementary motor area (SMA) of humans. Healthy right-handed participants performed repetitive individuated flexion-extension movements of digits 1, 2, and 3 using the dominant hand. Contralateral functional labeling for the group indicated a largely overlapping activation pattern in MI and SMA for the three digits. Consistent with recent findings, the geographic activation center in M1 for each finger differed, and we found some evidence of a homunculus organization pattern in M1 and SMA, but only for the central location of the representations. However, the statistical power for the homunculus pattern was weak, and the distance separating the digit geographical centers was typically less than 15% of the entire extent of digit representations in M1 or SMA. While separations for digit representations occurred, the entire data set provided more support for the concept of distributed, overlapping representations than for a classic homunculus organization for voluntary finger movements. (C) 2001 Academic Press.
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