Brunia C H, Van den Bosch W E
Electroencephalogr Clin Neurophysiol. 1984 Jun;57(6):515-27. doi: 10.1016/0013-4694(84)90087-7.
Movement-related potentials ( MRPs ) preceding a finger flexion and a plantar flexion of the foot on either side were compared over the frontal, central and parietal areas of both hemispheres. MRP amplitudes were larger preceding foot than preceding finger movements. In the first case their onset was earlier and their presence in the frontal area was more marked. Prior to a finger flexion amplitudes over the hemisphere contralateral to the movement side were larger than those recorded over the ipsilateral hemisphere. On the contrary, prior to a plantar flexion of the foot, amplitudes were larger over the hemisphere ipsilateral to the movement. These findings point to differently localized sources of the MRPs in the two cases. In other experiments larger amplitudes preceding foot movements were found near the midline. It is suggested that the ipsilateral preponderance prior to foot movements is caused by a contralateral source in the depth near the longitudinal fissure. The dipoles are presumably directed obliquely to the median plane. The ipsilateral preponderance is present both prior to and following the plantar flexion. This suggests comparable directions of the dipoles in the motor and somatosensory areas.
比较了两侧半球额叶、中央和顶叶区域在手指屈曲和两侧足部跖屈之前的运动相关电位（MRP）。足部运动前的MRP振幅大于手指运动前的MRP振幅。在第一种情况下，其起始更早，且在额叶区域的出现更明显。在手指屈曲之前，运动侧对侧半球上的振幅大于同侧半球上记录到的振幅。相反，在足部跖屈之前，运动同侧半球上的振幅更大。这些发现表明这两种情况下MRP的来源位置不同。在其他实验中，在中线附近发现足部运动前的振幅更大。有人提出，足部运动前同侧优势是由纵裂附近深处的对侧源引起的。偶极大概是斜向中平面的。同侧优势在跖屈之前和之后都存在。这表明运动区和体感区偶极的方向具有可比性。
