New method for titrating differences in scalp topographic patterns in brain evoked potential mapping.
A method is described for computing a Z estimator for the quantitative comparison of topographical patterns in 2 maps. Z can assume values between 1 and -1. The procedure is illustrated on a 3-shell head model for different configurations of current dipoles in the head space. The sensitivity of Z estimation can be adjusted by different weighting procedures or by using an average reference. When Z = 1 indicates identity of the set of active dipoles in the 2 maps compared, a dilation factor can be computed to estimate the enhanced or reduced activity of these generators.
Desmedt
J E
JE
Brain Research Unit, University of Brussels, Belgium.
Chalklin
V
V
D001921:Brain / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods*; D004566:Electrodes; D005071:Evoked Potentials; D006801:Humans; D008433:Mathematics; D012016:Reference Values; D012535:Scalp / Q000502:physiology*