[Mne_analysis] Inverse solution with only EEG data

[Lakshmi Krishnan]

Hi Christian,
I don't have measurements of head shape or electrode position.So with the canonical electrode positions what would be my first step?Which tool should I use to compute the bem model with 3 layers?
Thanks!
-Lakshmi
________________________________________
From: mne_analysis-bounces at nmr.mgh.harvard.edu [mne_analysis-bounces at nmr.mgh.harvard.edu] on behalf of Christian Brodbeck [christianbrodbeck at nyu.edu]
Sent: Saturday, November 22, 2014 10:48 AM
To: Alexandre Gramfort
Cc: Discussion and support forum for the users of MNE Software
Subject: Re: [Mne_analysis] Inverse solution with only EEG data

So then I think for using the fsaverage brain with EEG you would need to create a new bem model with 3 layers, because fsaverage-inner_skull-bem.fif that comes with mne only has one layer.

Also, Lakshmi, do you have any kind of measurement of the spatial properties of the subjects’ head shapes? In order to scale the fsaverage brain for a more realistic head model you would need head shape and/or electrode position measurements. Without any measurements I assume the best you can do is just use the unscaled fsaverage brain(?) in which case we would need canonical electrode positions for fsaverage...
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