Mapping EEG-potentials on the surface of the brain: A strategy for uncovering cortical sources

被引:103
作者
Junghofer, M [1 ]
Elbert, T [1 ]
Leiderer, P [1 ]
Berg, P [1 ]
Rockstroh, B [1 ]
机构
[1] UNIV KONSTANZ,DEPT PHYS,D-78434 CONSTANCE,GERMANY
关键词
high spatial sampling EEG; spatial deblurring; current source density; cortical mapping; spherical spline interpolation; inverse problem;
D O I
10.1007/BF01190389
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
This paper describes a uniform method for calculating the interpolation of scalp EEG potential distribution, the current source density (CSD), the cortical potential distribution (cortical mapping) and the CSD of the cortical potential distribution. It will be shown that interpolation and deblurring methods such as CSD or cortical mapping are not independent of the inverse problem in potential theory. Not only the resolution but also the accuracy of these techniques, especially those of deblurring, depend greatly on the spatial sampling rate (i.e., the number of electrodes). Using examples from simulated and real (64 channels) data it can be shown that the application of more than 100 EEG channels is not only favourable but necessary to guarantee a reasonable accuracy in the calculations of CSD or cortical mapping. Likewise, it can be shown that using more than 250 electrodes does not improve the resolution.
引用
收藏
页码:203 / 217
页数:15
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