BEM: skull surfaces intersect

💬 Support & Discussions
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Hi MNE users,

I am trying to see the EEG source localization for the evoked response for my subjects. However,I got an error that said " the surfaces of the inner skull is not completely inside the outer skull". A solution that I saw on different forums was to use only one conductivity parameter [0.3], instead of the default three. However, it doesn’t work for EEG as it requires 3 layer BEM instead of just one.

3 out of 5 subjects I am working with have the same problem. Is there fix to this problem?

What arguments in the bem.make_watershed_bem( ) could solve this? Currently, I have been using

mne.bem.make_watershed_bem( subject , subjects_dir , volume=‘T1’ ,atlas=False , gcaatlas=False , preflood=None , show=False , copy=False , T1=None , brainmask=‘ws.mgz’ , verbose=None )

2

see if setting atlas params to True helps and if not you should try editing the surfaces manually using
blender. See https://mne.tools/dev/auto_tutorials/forward/80_fix_bem_in_blender.html

Alex