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

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...

Full description

Saved in:
Bibliographic Details
Published in:Brain topography 1997, Vol.9 (3), p.203-217
Main Authors: Junghöfer, M, Elbert, T, Leiderer, P, Berg, P, Rockstroh, B
Format: Article
Language:English
Subjects:
Brain - physiology
Brain Mapping
Computer Simulation
Electricity
Electroencephalography
Humans
Models, Neurological
Surface Properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0896-0267
1573-6792
DOI:10.1007/bf01190389