Estimation of structures of neural fibers in the human brain by vectorial magnetic stimulation
Estimation of structures of neural fibers in the human brain by vectorial magnetic stimulation
复制标题
通过矢量磁刺激估计人脑神经纤维的结构
DOI：
--
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
O. Hiwaki
中科院分区：
文献类型：
--
作者：
S. Ueno;T. Matsuda;O. Hiwaki
提出了一种聚焦矢量磁刺激方法。基本思想是通过一对相反的脉冲磁场将感应涡流集中在一个目标中，这种磁场可以由一个8字线圈产生。由于线圈交点下方目标处的集中涡流沿平行于两个圆形线圈切线的方向流动，因此可以实现矢量激励。当与神经纤维平行的涡流刺激中性纤维时，中性纤维很容易被激发。基于这一原理，已经获得了与手和脚区域相关的人类运动皮层的功能图。结果表明，在大脑皮层各功能区均存在神经刺激电流的最佳方向。为了解释脑磁刺激的这些矢量特征，建立了磁刺激引起的神经兴奋模型。该模型解释了观察到的感应电流矢量的方向反映了大脑中神经纤维的功能和解剖组织。>
A method of focal and vectorial magnetic stimulation has been developed. The basic idea is to concentrate induced eddy currents in a target by a pair of opposing pulsed magnetic fields which can be produced by a figure-of-eight coil. Since the concentrated eddy currents at the target beneath the intersection of the coil flow in the direction parallel to the tangent of the two circular coils, vectorial stimulation can be achieved. The neutral fibers can be excited easily when the fibers are stimulated by the eddy currents which flow parallel to the neural fibers. Based on this principle, functional maps of the human motor cortex related to the hand and foot areas have been obtained. It was observed that an optimal direction of stimulating currents for neural excitation exists in each functional area in the cortex. To explain these vectorial characteristics in magnetic brain stimulation, a model of neural excitation elicited by magnetic stimulation was developed. The model explains the observation that the direction of the induced current vectors reflects both the functional and anatomical organization of neural fibers in the brain. >