You can do LORETA inverse solution to go from EEG to voxels which approximate internal sources. The problem is that this model does several suppositions about t

You can do LORETA inverse solution to go from EEG to voxels which approximate internal sources. The problem is that this model does several suppositions about the brain structure that may or may not be true. In my opinion, surface currents are only good for surface sources, as the neurons in cortex are aligned and thus generate relatively strong currents in comparison to neurons inside the brain which are positioned "randomly".