Hello again (2) and sorry for the multiple questions.
I have a related question concerning the digitized head points used by warping. We use a sponge-based EEG system (RNet, Brain Products). Differently from gel-based systems, here the electrodes are not attached to the scalp, but they are separated by the sponges, which are approximately 9 mm thick when recording a subject. Therefore, I think it is more correct to use as head points for warping not the position of the electrodes but the corresponding position on the scalp, 9 mm inward. However, it seems to me that once I have uploaded the EEG channel file, BST automatically considers the channel points as head points. Also, it automatically loads the head points associated with the default anatomy. Due to this, I need to
- first upload the channel file with the correct channel positions,
- then remove all additional head points (Digitized head points > Remove all points),
- then upload as additional head points the channel points moved 9 mm inward and additional digitized points.
Is this correct? Is there a simpler way to do this? And is this worth for more precise source reconstruction (which is of course the only motivation for all this 
)?
Thanks,
Marco