Li A, Yetkin F Z, Cox R, Haughton V M
Department of Radiology, Medical College of Wisconsin, Milwaukee 53226, USA.
AJNR Am J Neuroradiol. 1996 Apr;17(4):651-5.
To compare activation of the ipsilateral cerebral hemisphere during tactile sensory and motor tasks involving the right and left hands.
Eight volunteers had functional MR imaging to measure the extent of cerebral hemisphere activation during a motor task and 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 two tasks and the two hands were compared.
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.
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.
比较在涉及右手和左手的触觉感觉及运动任务期间同侧大脑半球的激活情况。
八名志愿者进行了功能磁共振成像，以测量在涉及每只手的运动任务和感觉任务期间大脑半球的激活程度。计算每只手和每个任务的半球指数（左半球激活减去右半球激活）/（左半球激活加上右半球激活）。比较两个任务和两只手的指数。
在右利手者中，左手运动任务比右手任务更显著地激活同侧半球。运动任务比感觉任务产生更大的同侧半球激活。右手和左手感觉任务的半球指数之间未发现显著差异。
本研究证实了先前一项研究的结果，表明左半球在左手运动任务中活跃。同侧半球在感觉任务期间的激活明显不如运动任务期间明显。
