Abstract
PURPOSE: To compare activation of the ipsilateral cerebral hemisphere during tactile sensory and motor tasks involving the right and left hands. METHODS: Eight volunteers had functional MR imaging to measure the extent of cerebral hemisphere activation during a motor task and a sensory task involving each hand. Hemispheric indexes (left hemisphere activation minus right hemisphere activation)/(left hemisphere activation plus right hemisphere activation) were computed for each hand and each task. The indexes for the two tasks and the two hands were compared. RESULTS: The left-hand motor tasks activated the ipsilateral hemisphere in right handers significantly more than did the right-hand tasks. Motor tasks produced a greater activation of the ipsilateral hemisphere than did the sensory tasks. No significant differences were found between the hemispheric indexes for the right-hand and left-hand sensory tasks. CONCLUSION: This study confirms findings of a previous study, showing that the left hemisphere is active in left-hand motor tasks. Activation of the ipsilateral hemisphere is significantly less pronounced during sensory tasks than during motor tasks.
Original language | English (US) |
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Pages (from-to) | 651-655 |
Number of pages | 5 |
Journal | American Journal of Neuroradiology |
Volume | 17 |
Issue number | 4 |
State | Published - Apr 1 1996 |
Keywords
- Brain, magnetic resonance
- Magnetic resonance, functional
- Movement
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Clinical Neurology