Brain Topography

, Volume 9, Issue 3, pp 203–217

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

Authors

  • Markus Junghöfer
    • Department of Psychology and Department of PhysicsUniversity of Konstanz
  • Thomas Elbert
    • Department of Psychology and Department of PhysicsUniversity of Konstanz
  • Paul Leiderer
    • Department of Psychology and Department of PhysicsUniversity of Konstanz
  • Patrick Berg
    • Department of Psychology and Department of PhysicsUniversity of Konstanz
  • Brigitte Rockstroh
    • Department of Psychology and Department of PhysicsUniversity of Konstanz
Article

DOI: 10.1007/BF01190389

Cite this article as:
Junghöfer, M., Elbert, T., Leiderer, P. et al. Brain Topogr (1997) 9: 203. doi:10.1007/BF01190389

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.

Key words

High spatial sampling EEG Spatial deblurring Current source density Cortical Mapping Spherical spline interpolation Inverse problem

Copyright information

© Human Sciences Press, Inc. 1997