Fig 6.

A-D: Comparisons of different head models for the “after” recording for position A1. Single sphere models (C & D) do not result in a smoothly-varying dipole field pattern. Single shell models, however (A & B) show very similar estimations of the magnetic field generated by the source underlying N20m. The full rank model is less stable than the reduced rank model, which also shows some temporal discontinuities, e.g., before the peak of the N20m activation. E-H: Residual variance for the models.