Seyal M, Browne J K
Department of Neurology, University of California, Davis Medical Center, Sacramento 95817.
Electroencephalogr Clin Neurophysiol. 1989 Jul-Aug;74(4):271-6. doi: 10.1016/0168-5597(89)90057-9.
Trigeminal somatosensory evoked potentials were recorded over the scalp using non-cephalic reference sites following mechanical taps to the face. A negative wave form, Nf17, was recorded bilaterally with its highest amplitude over the frontal scalp contralateral to the side of stimulation. A localized negative wave form, Np25, was recorded over the centro-parietal scalp contralateral to the side of stimulation. Np25 had an onset latency of 16.46 msec. The location and restricted spatial distribution of Np25 suggest that it represents the initial activation of the face area of the primary sensory cortex. The widespread bilateral nature of Nf17 and its latency of onset preceding that of Np25 suggest that Nf17 may be a 'far-field' potential reflecting activity in subcortical sensory pathways subserving the face.
在面部进行机械轻敲后，使用非头部参考点在头皮上记录三叉神经体感诱发电位。记录到一个双侧的负向波形Nf17，其最高波幅出现在刺激侧对侧的额部头皮。在刺激侧对侧的中央顶叶头皮记录到一个局部负向波形Np25。Np25的起始潜伏期为16.46毫秒。Np25的位置和局限的空间分布表明它代表初级感觉皮层面部区域的初始激活。Nf17广泛的双侧特性及其起始潜伏期先于Np25，这表明Nf17可能是一种“远场”电位，反映了服务于面部的皮层下感觉通路的活动。
