[Mne_analysis] question on mne_surf2bem for MEG/EEG combined

[Elisabeth Fonteneau]

Dear all,

I am a new user of MNE (post-doc MRC-CBU, Cambridge, UK),
and I already have some question for this mailing list.

I am analysing data that combined MEG & MEG and I have a question on the 
following command (taken from MEG analysis alone)

mne_surf2bem --surf $SUBJECTS_DIR/<participant>/surf/lh.smseghead --id 4 --fif <participant>-head.fif

For the EEG I need 3 layers BEM (skull, brain and skin)

In the manual for MNE p76 it says " --surf <name>" Specifies a 
FreeSurfer binary format surface file. Before specifying
the next surface (--surf or --tri options) details of the surface 
specification can be given with the options listed in Section 5.4.2. "
for the  --id option, the identification number to assign to this 
surface. (1 = inner skull, 2 =outer skull, 4 = scalp).

My question is the following
On this command above the file lh.smseghead correspond to the layer bem 
of the scalp (--id 4) ONLY or is there also inside the info for the 
other layers ???
If the info for the other layers are also in the same file how I do I 
write the proper command

mne_surf2bem --surf $SUBJECTS_DIR/<participant>/surf/lh.smseghead --id 4 
--id 2 --id 1 --fif <participant>-head.fif

or do I need to call 3 times the same file?

mne_surf2bem --surf $SUBJECTS_DIR/<participant>/surf/lh.smseghead --id 4 
--surf $SUBJECTS_DIR/<participant>/surf/lh.smseghead --id 2 
--surf $SUBJECTS_DIR/<participant>/surf/lh.smseghead --id 1 
--fif <participant>-head.fif

If this is not the case that the different layers are in the same file, 
which files should I prompt? in the directory /surf/ they are 56 others 
and it is not explained anywhere which is what. (btw, I do not 
understand why this file has "lh." affix does that mean it is only for 
left hemisphere? there are also "rh." files...)


Thanks in advance for your help

Regards,

E. Fonteneau

-- 
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Dr Elisabeth Fonteneau
MRC Cognition and Brain Sciences Unit
15 Chaucer Road
Cambridge CB2 7EF
England
Tel:  +44 (0)1223 355294 (extension 263)
Fax:  +44 (0)1223 359062 

Email: elisabeth.fonteneau at mrc-cbu.cam.ac.uk
Web: http://www.mrc-cbu.cam.ac.uk/people/elisabeth.fonteneau/
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