Thanks so much for your replies.
Vladimir: As far as I can tell it is only possible to construct 3-layered BEM forward models, also in OpenMeeg run outside the SPM GUI.
The Neuroelectromagnetic Forward Head Modeling (NFT) toolbox (Zeynep Akalin Acar & S. Makeig, 2010) seems able to construct 4-layered BEM forward models. Does anyone have experience using this?
Gregor: Perhaps you are right that I need to use FEM instead. It would definitely be nice with som help! The goal is to be able to construct forward models from sMRIs (T1-weighted) and specified conductivity ratios.
Thanks again!
Sofie
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