[Analysis of the generators of early cortical somatosensory evoked potentials (N. medianus) using dipole source analysis: initial results].

H Buchner, M Scherg
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Abstract

There is still much controversy about the contribution of the brainstem, the thalamus and the somatosensory and motor areas of the various scalp recorded peaks of the somatosensory evoked potentials (SEP) after median nerve stimulation. This study addressed the generator problem of the scalp recorded potentials using brain electric source analysis. In 11 normal subjects median nerve SEPs were recorded from 32 locations. The brain-electric-source-analysis revealed a minimum of 5 sources with overlapping activities in the interval of 12-35 ms post stimulus. The initial deflections were in the time range of the scalp peaks (P14, P18, N20, P22, N30), but there was no single source to fully explain a scalp peak except for the brainstem source of P14. The other sources appeared to reflect activities of the thalamo-cortical-pathway (P18), of the somatosensory areas 3b (N20) and 1 (P22) and of a fifth source (contribution maximal around 30 ms) with no consistent location. The close location of multiple sources makes the precise separation and localisation of the various sources quite difficult in individual data sets.

[用偶极子源分析早期皮层体感诱发电位(N. medianus)的产生器:初步结果]。
关于正中神经刺激后,脑干、丘脑以及头皮各体感区和运动区所记录的体感诱发电位(SEP)峰值的贡献,目前还存在很多争议。本研究利用脑电源分析解决了头皮记录电位产生的问题。在11例正常受试者中,记录32个部位的正中神经sep。脑电源分析显示,在刺激后12 ~ 35 ms的时间间隔内,至少有5个脑电源存在重叠活动。初始偏转在头皮峰值(P14, P18, N20, P22, N30)的时间范围内,但除了P14的脑干来源外,没有单一来源可以完全解释头皮峰值。其他来源似乎反映了丘脑-皮质通路(P18)、体感区3b (N20)和1 (P22)的活动,以及第五个来源(贡献最大约30毫秒)的活动,但没有一致的位置。多个源的近距离位置使得在单个数据集中精确分离和定位各种源相当困难。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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