A TEST OF BRAIN ELECTRICAL SOURCE ANALYSIS (BESA) - A SIMULATION STUDY
A TEST OF BRAIN ELECTRICAL SOURCE ANALYSIS (BESA) - A SIMULATION STUDY
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DOI：
10.1016/0013-4694(94)90193-7
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发表时间：
1994-10-01
期刊：
影响因子：
--
通讯作者：
RUCHKIN, DS
中科院分区：
文献类型：
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作者：
MILTNER, W;BRAUN, C;RUCHKIN, DS
本报告总结了一项模拟研究的结果，该研究涉及 Scherg 实施时空分析 (BESA) 的准确性，该分析用于估计从头皮记录的事件相关脑电位 (ERP) 颅内源的参数（波形、位置、方向）。考虑到可能影响解决方案的主观因素，10名受试者（从具有丰富的ERP经验和广泛的BESA使用背景到那些很少使用BESA和/或不了解ERP的受试者）独立分析了一组模拟体感ERP数据。模拟包含由 10 个偶极子源组合生成的 32 个电极位置的波形。主要问题是不同的受试者如何忠实地描绘源波形、位置和方向。基于熟悉 ERP 的 9 名受试者，受试者估计的源波形与实际源波形之间的总平均互相关系数为 0.89（标准差 (S.D.) = 0.17）。基于 17 厘米的头部直径，总平均位置误差为 1.4 厘米（S.D. = 1.0 厘米）。总平均方向误差为 24.4 度（S.D. = 20 度）。
The present report summarizes the results of a simulation study on the accuracy of Scherg's implementation of spatio-temporal analysis (BESA) for estimating the parameters (wave shape, location, orientation) of the intracranial sources of event-related brain potentials (ERPs) recorded from the scalp. In view of the subjective factors that might influence a solution, 10 subjects, ranging from those with much experience with ERPs and extensive background in the use of BESA to those with little experience with BESA and/or no knowledge of ERPs, independently analyzed a set of simulated somatosensory ERP data. The simulation contained wave forms from 32 electrode sites generated by a combination of 10 dipole sources. The primary question was how faithfully the different subjects would depict the source wave shapes, locations and orientations. Based on the 9 subjects who were familiar with ERPs, the grand-average cross-correlation coefficient between subjects' estimated and actual source wave shapes was 0.89 (standard deviation (S.D.) = 0.17). The grand-average location error, based upon a head diameter of 17 cm, was 1.4 cm (S.D. = 1.0 cm). The grand-average orientation error was 24.4 degrees (S.D. = 20 degrees).