HEMISPHERIC THRESHOLD DIFFERENCES FOR MOTOR EVOKED-POTENTIALS PRODUCED BY MAGNETIC COIL STIMULATION
HEMISPHERIC THRESHOLD DIFFERENCES FOR MOTOR EVOKED-POTENTIALS PRODUCED BY MAGNETIC COIL STIMULATION
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DOI：
10.1212/wnl.41.9.1441
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发表时间：
1991-09-01
期刊：
影响因子：
9.9
通讯作者：
SHAHANI, BT
中科院分区：
文献类型：
--
作者：
MACDONELL, RAL;SHAPIRO, BE;SHAHANI, BT
通过电磁线圈的短暂单相脉冲优先激活每个半球的运动通路，这取决于线圈电流的方向。 使用每个半球的首选方向，诱发对侧小指展肌（ADM）肌肉复合肌肉动作电位的最小刺激强度（阈值）明显低于左半球比右半球。 每侧肱二头肌阈值均显著高于ADM，但无侧间差异。 用标准的惯用手指数来评估惯用手，那些不太倾向于用右手完成日常任务的人在两个半球之间的ADM阈值有更大的差异。 左半球投射到手部肌肉的阈值较低，这可能与皮质运动神经元单突触连接的不对称性有关;投射到右侧肌肉的运动神经元池的数量比左侧肌肉多。
A brief monophasic pulse through an electromagnetic coil preferentially activates motor pathways of each hemisphere, depending on the direction of coil current flow. Using the preferred direction for each hemisphere, the minimum stimulus intensity (threshold) that evoked compound muscle action potentials in the contralateral abductor digiti minimi (ADM) muscle was significantly less for the left hemisphere than the right. Threshold for biceps on each side was significantly higher than ADM, but there was no side-to-side difference. Assessing handedness using a standard handedness index, those who had less tendency to use the right hand for everyday tasks had greater differences between hemispheres for ADM thresholds. The lower threshold of the left-hemisphere projection to hand muscles is probably related to the asymmetry of corticomotoneuronal monosynaptic connections; a greater number project to the motor neuron pool of the right- than left-hand muscles.