Quantitative approximation of the cortical surface potential from EEG and ECoG measurements.
A quantitative approximation of the cortical surface potential from measured scalp surface potential data is developed. The derivation is based on a local Taylor series expansion (TSE) in the surface normal coordinate. Analytical and numerical results for the four shell spherical head model show that the TSE method improves the spatial deblurring of the surface Laplacian method. The inclusion of the biharmonic term, the extension to other geometries, and the application to electrocorticogram measurements are discussed.
Graduate Group in Applied Science and Technology, University of California, Berkeley, CA 94720-1708, USA. markram@berkeley.edu
Mark A
MA
Kramer
Andrew J
AJ
Szeri
D000465:Algorithms; D001931:Brain Mapping / Q000379:methods*; D002540:Cerebral Cortex / Q000502:physiology*; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004569:Electroencephalography / Q000379:methods*; D006801:Humans; D008959:Models, Neurological; D012535:Scalp / Q000502:physiology*