Influence of touching an object on corticospinal excitability during motor imagery
Influence of touching an object on corticospinal excitability during motor imagery
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DOI：
10.1007/s00221-009-1875-5
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发表时间：
2009-07-01
影响因子：
2
通讯作者：
Kanosue, Kazuyuki
中科院分区：
文献类型：
--
作者：
Mizuguchi, Nobuaki;Sakamoto, Masanori;Kanosue, Kazuyuki
我们调查是否皮质脊髓兴奋性的图像涉及外部对象的行动受到实际触摸的对象。皮质脊髓兴奋性进行了评估，监测运动诱发电位（MEP）在第一背侧骨间肌经颅磁刺激后，在运动皮层的图像挤压一个球，有或没有被动举行的球。握球时的MEP幅值大于不握球时的MEP幅值。握球并不能调制MEP的振幅。在相同的实验条件下，正中神经刺激引起的体感诱发电位（SEP）不受运动想象和持球的调制。这些结果表明，在挤压一个球的形象与真实的触摸球的皮质脊髓兴奋性增强，增强将引起的一些变化沿着皮质通路本身，而不是由反应的变化沿着传入通路的初级体感皮层。
We investigated whether corticospinal excitability during the imagery of an action involving an external object was influenced by actually touching the object. Corticospinal excitability was assessed by monitoring motor evoked potentials (MEPs) in the first dorsal interosseous muscle following transcranial magnetic stimulation over the motor cortex during imagery of squeezing a ball-with or without passively holding the ball. The MEPs amplitude during imagery when the ball was held was larger than that when the ball was not held. The MEPs amplitude was not modulated just by holding the ball. In the same experimental condition, the somatosensory evoked potentials (SEPs) in response to the stimulation of median nerve were not modulated by motor imagery or by holding the ball. These results suggest that the corticospinal excitability during imagery of squeezing a ball is enhanced with the real touch of the ball, and the enhancement would be caused by some changes along the corticospinal pathway itself and not by the change in responsiveness along the afferent pathway to the primary somatosensory cortex.