IPSILATERAL AND CONTRALATERAL SEP COMPONENTS FOLLOWING MEDIAN NERVE-STIMULATION - EFFECTS OF INTERFERING STIMULI APPLIED TO THE CONTRALATERAL HAND
IPSILATERAL AND CONTRALATERAL SEP COMPONENTS FOLLOWING MEDIAN NERVE-STIMULATION - EFFECTS OF INTERFERING STIMULI APPLIED TO THE CONTRALATERAL HAND
复制标题
DOI：
10.1016/0013-4694(86)90172-0
复制
发表时间：
1986-09-01
期刊：
影响因子：
--
通讯作者：
KAKIGI, R
中科院分区：
文献类型：
--
作者：
KAKIGI, R
在有或无干扰运动、触觉和振动活动的情况下，分析电刺激正中神经同侧和对侧半球记录的体感诱发电位(SEP)。在控制波中，在同侧额区记录的早期电位P19和N25在对侧顶区分别与N19和P25显示明显的相位反转，因此被认为是由同一发生器在初级感觉皮层产生的。在同侧半球上记录的所有其他电位与对侧的电位具有相同的极性和相似的潜伏期，且其幅度随着距离对侧半球的距离而递减。因此，它们被认为是来自对侧大脑半球的体积传导，而不是通过未交叉的上升通路或半球间连接起源于同侧大脑半球。对侧手的干扰活动产生的影响的分布是通过从对照反应中减去‘’干扰‘’而得出‘’差‘’波形的。对侧头皮上存在的差异电位与对侧大脑半球的影响是一致的。尤其是，对侧手的随意运动在3a或4区产生了按照所建议的发生器分布的差异电位。在同侧顶区没有发现一致的差异电位。然而，在同侧额叶区域，一个潜伏期约为55毫秒的向上电位被认为是由于对侧大脑半球辅助运动区的一个发生器所致。
Somatosensory evoked potentials (SEPs) recorded over the hemisphere ipsilateral and contralateral to the electrically stimulated median nerve were analysed in the presence or absence of interfering movement, tactile and vibratory activity in the contralateral hand. In the control wave forms the early potentials recorded over the ipsilateral frontal region, P19 and N25, showed apparent phase reversal with N19 and P25 respectively in the contralateral parietal region and were therefore considered to be produced by the same generator in the primary sensory cortex. All other potentials recorded over the ipsilateral hemisphere were of the same polarity and similar latency to potentials present contralaterally, and their amplitude diminished progressively with distance from the contralateral hemisphere. They were therefore believed to be volume-conducted from the contralateral hemisphere, rather than originating in the ipsilateral hemisphere through uncrossed ascending pathways or interhemispheric connections. The distribution of effects produced by interfering activity in the contralateral hand was demonstrated by subtracting the ''interference'' from the control'' response to derive a ''difference'' waveform. Difference potentials present over the contralateral scalp were consistent with influence on generators in the contralateral hemisphere. In particular, voluntary movement of the contralateral hand resulted in difference potentials distributed in accordance with a proposed generator in area 3a or 4. No consistent difference potentials were found in the ipsilateral parietal region. In the ipsilateral frontal region, however, an upward potential whose latency was around 55 msec was proposed to be due to a generator in the supplementary motor area of the contralateral hemisphere.