This repository contains code implementing the method published by Perrin, Pernier, Bertrand, Echallier, Spherical splines for scalp potential and current density mapping, Electroencephalography and Clinical Neurophysiology 72(2), 184-187, 1989.
[c_Op, c0_Op, L_Op] = sphericalSplineOperators(coords, m)
The important output is L_Op, which is a square matrix that transforms the
raw data matrix of EEG channels into the matrix of SCD channels. The input
coords gives the 3d-coordinates of the electrodes. m is the order of the
spherical spline, I normally use m = 4.
g = sphericalSpline(x, m)
This is a helper function for sphericalSplineOperators that implements the
spherical spline function.
[mcnCoords, mcnNames] = mcnSystem(opt)
If opt is omitted, this function calculates theoretical 3d-coordinates for
the electrodes of the Modified Combinatorial Nomenclature; the corresponding
names are given in the second output. This can be used to provide coordinates
for sphericalSplineOperators.