Buchner H, Ludwig I, Waberski T, Wilmes K, Ferbert A
Department of Neurology, University Hospital RWTH Aachen, FRG.
Electromyogr Clin Neurophysiol. 1995 Jun-Jul;35(4):207-15.
Scalp topography of the early cortical SEPs was analysed in 50 normal right handed subjects. The following hemispheric asymmetries of the potentials were found: 1) The maximal amplitude of N20 was located predominantly at the P electrode after right sided stimulation, but varied between the CP, P and O electrode after left sided stimulation. 2) The N20 amplitudes were higher after right sided stimulation in approximately 70% of the subjects and the P25 and N30 amplitudes were higher after left sided stimulation in again approximately 70% of the subjects. No side difference of amplitudes was found for the subcortical N14. The N20 amplitude and location asymmetries were attributed to an anatomical asymmetry of the somatosensory cortex.
对50名正常右利手受试者的早期皮质体感诱发电位的头皮地形图进行了分析。发现了以下电位的半球不对称性：1）右侧刺激后，N20的最大振幅主要位于P电极处，但左侧刺激后，其在CP、P和O电极之间变化。2）在大约70%的受试者中，右侧刺激后的N20振幅较高，而在大约70%的受试者中，左侧刺激后的P25和N30振幅较高。皮质下N14的振幅未发现侧别差异。N20振幅和位置的不对称性归因于体感皮层的解剖学不对称。
