Hashimoto I, Mashiko T, Mizuta T, Imada T, Iwase K, Okazaki H
Department of Psychophysiology, Tokyo Institute of Psychiatry, Japan.
Electroencephalogr Clin Neurophysiol. 1994 Dec;93(6):459-67. doi: 10.1016/0168-5597(94)90154-6.
Magnetic compound action fields (CAFs) over the right arm were measured from 63 sensor positions with two 7-channel SQUID gradiometer systems following electrical stimulation of the median nerve at the wrist. The field mapping of the CAFs revealed a propagating quadrupolar pattern with the leading depolarization and trailing repolarization fronts. The average distribution of the CAFs in the longitudinal direction was 9.0 cm in length for the depolarization field and 7.3 cm for the repolarization field in good agreement with a theoretical prediction based on the duration (3 msec) of the CAFs and the conduction velocity of the nerve (50 m/sec). The distance between the maxima of the depolarization front and the minima of the repolarization front was 6.3 cm. This spatial separation of the leading and trailing dipole locations suggests in part mutual cancellation of the fields with opposite polarity at or near the depolarized segment of nerve fibers.
在手腕处对正中神经进行电刺激后，使用两个7通道超导量子干涉仪梯度计系统，从63个传感器位置测量右臂上的磁性复合动作场（CAF）。CAF的场图显示出一种传播的四极模式，具有领先的去极化和尾随的复极化前沿。CAF在纵向的平均分布长度，去极化场为9.0厘米，复极化场为7.3厘米，这与基于CAF的持续时间（3毫秒）和神经传导速度（50米/秒）的理论预测高度一致。去极化前沿的最大值与复极化前沿的最小值之间的距离为6.3厘米。这种领先和尾随偶极子位置的空间分离部分表明，在神经纤维去极化段或其附近，具有相反极性的场相互抵消。
