Comparisons of interpolation techniques for topographic brain mapping using simulated potentials

In this work the authors present a quantitative comparison of the four Nearest-Neighbour, Planar Spline and Spherical Spline interpolation techniques. Simulated distributions of scalp potentials derived from dipoles inside a model consisting of three concentric spherical shells were evaluated using global error measures. Differences in the performance of the three interpolation techniques depending on the location of the source were found. The results indicate that for electrode densities similar to those provided by the 10-20 system, none of the interpolation technique is clearly superior, with relative performance depending strongly on electrode location