Physiological motor asymmetry in human handedness: evidence from transcranial magnetic stimulation
Physiological motor asymmetry in human handedness: evidence from transcranial magnetic stimulation
复制标题
人类惯用手的生理运动不对称：来自经颅磁刺激的证据
DOI：
10.1016/0006-8993(94)91026-x
复制
发表时间：
1994
期刊：
影响因子：
2.9
通讯作者：
K. Chiappa
中科院分区：
文献类型：
--
作者：
W. Triggs;R. Calvanio;R. Macdonell;D. Cros;K. Chiappa
我们假设人类的利手习惯可能与运动系统兴奋性的可测量差异有关。我们比较了30名左撇子和30名右利手的左右拇短展肌（APB）和肱二头肌肌肉的肌电图激活阈值，通过改变位于头皮顶部的圆形电磁线圈中的短暂单相脉冲的方向。我们发现，右撇子右臂肌肉的激活阈值低于左臂相应肌肉的激活阈值，而左撇子则相反。阈值不对称的影响显着的一致性，每个主题使用的书写手执行其他运动任务，并不显着之间的不一致的左撇子和右撇子。我们的研究结果表明，人类的惯用手，特别是，一致性的手的偏好，与偏侧差异的运动系统的预测激活经颅磁刺激的兴奋性。我们的发现可能反映了皮质脊髓束功能或皮质运动表征的生理差异。
We hypothesized that human handedness might be associated with measurable differences in the excitability of the motor system. We compared the thresholds for electromyographic activation of the left and right abductor pollicis brevis (APB) and biceps muscles in 30 left-handers and 30 right-handers, by varying the direction of a brief monophasic pulse in a circular electromagnetic coil centered over the vertex of the scalp. In right-handers, we found that the threshold for activation of muscles in the right arm was lower than the threshold for activation of corresponding muscles in the left arm. In left-handers, the reverse was true. Threshold asymmetry was influenced significantly by the consistency with which each subject used the writing hand to perform other motor tasks, and was not significant between non-consistent left-handers and right-handers. Our results indicate that human handedness, and in particular, consistency of hand preference, are associated with lateralized differences in the excitability of motor system projections activated by transcranial magnetic stimulation. Our findings might reflect physiological differences in corticospinal tract function or cortical motor representation.
影响因子：
14.5
作者：
WITELSON, SF
通讯作者：
WITELSON, SF