Ipsilateral movement-evoked fields reconsidered
Ipsilateral movement-evoked fields reconsidered
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DOI：
10.1006/nimg.1999.0485
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发表时间：
1999-11-01
期刊：
影响因子：
5.7
通讯作者：
Imada, T
中科院分区：
文献类型：
--
作者：
Hari, R;Imada, T
运动诱发场（MEFs）的产生机制知之甚少，同侧MEFs的存在仍存在争议。我们记录了8名受试者的整个头皮神经磁活动，他们用右手第二和第四个手指交替按下响应键，同时保持左手掌放在装有键的桌子上。清晰的同侧MEF在按键触摸后58 +/- 2 ms达到峰值，其来源于右侧初级体感皮层的手部区域。当静止的左手手掌向上放在桌子上时，同侧MEF减小到一半大小。然而，当另一个人操作响应键时，受试者的左手掌保持在桌子上时，得到了非常相似的反应。当受试者只看到这些动作而没有手接触桌子时，没有信号被引出。结果表明，MEFs接收触觉输入的强大的贡献。在我们的实验中，同侧感觉运动激活是由运动相关的振动传递到休息的手触发的。(C)北京：科学出版社.
The generation mechanism of movement-evoked fields (MEFs) is poorly known and the existence of ipsilateral MEFs is still in dispute. We recorded whole-scalp neuromagnetic activity from eight subjects who were pressing response keys alternately with the right 2nd and 4th digits, while keeping the left palm on the table containing the keys. Clear ipsilateral MEFs peaked 58 +/- 2 ms after the key touch, with sources in the hand area of the right primary somatosensory cortex. The ipsilateral MEFs decreased to half size when the resting left hand was palm up on the table. However, very similar responses were obtained when another person operated the response keys and the subjects just kept their left palm on the table. No signals were elicited when the subjects only viewed these actions with no hand contact to the table. The results indicate that the MEFs receive a strong contribution from tactile input. In our experiment the ipsilateral sensorimotor activation was triggered by the movement-related vibrations transmitted to the resting hand. (C) 1999 Academic Press.