[Mne_analysis] problem with mne_setup_source_space : Source space creation failed

[Lucille Lecoutre]

Dear All,

I have a problem with the creation of the source space
(mne_setup_source_space)  with the -ico 5 option for one particular
subject. Here is the error reported by MNE :

--------------------------------------------------------------
$ mne_setup_source_space --ico 5 --overwrite

Setting up the source space with the following parameters:

SUBJECTS_DIR = /neurospin/meg/meg_tmp/AVclock_Lucille_2013/mri/
Subject      = tc_120199
Surface      = white
Icosahedron subdivision grade 5

>>> 1. Creating the source space file
/neurospin/meg/meg_tmp/AVclock_Lucille_2013/mri//tc_120199/bem/tc_120199-ico-5-src.fif...

mne_make_source_space version 2.6 compiled at May  6 2013 04:18:39

Loading
/neurospin/meg/meg_tmp/AVclock_Lucille_2013/mri//tc_120199/surf/lh.white...
Triangle file : created by LLECOUTR on Wed May  1 02:26:12 2013 nvert =
136783 ntri = 273562
    Triangle and vertex normals and neighboring triangles...[done]
    Vertex neighbors...[done]
    Distances between neighboring vertices...[820686 distances done]
Doing the icosahedral vertex picking...
Loading geometry from
/neurospin/meg/meg_tmp/AVclock_Lucille_2013/mri//tc_120199/surf/lh.sphere...
Triangle file : created by LLECOUTR on Wed May  1 03:29:58 2013 nvert =
136783 ntri = 273562
    Triangle and vertex normals and neighboring triangles...[done]
    Vertex neighbors...[done]
    Distances between neighboring vertices...[61440 distances done]
Mapping lh tc_120199 -> ico (5) ...[done]
Setting up the triangulation for the decimated surface...
loaded lh.white 10242/136783 selected to source space (ico = 5)

Loading
/neurospin/meg/meg_tmp/AVclock_Lucille_2013/mri//tc_120199/surf/rh.white...
Triangle file : created by LLECOUTR on Wed May  1 04:55:58 2013 nvert =
137309 ntri = 274614
    Triangle and vertex normals and neighboring triangles...[done]
    Vertex neighbors...[done]
    Distances between neighboring vertices...[823842 distances done]
Doing the icosahedral vertex picking...
Loading geometry from
/neurospin/meg/meg_tmp/AVclock_Lucille_2013/mri//tc_120199/surf/rh.sphere...
Triangle file : created by LLECOUTR on Wed May  1 06:15:31 2013 nvert =
137309 ntri = 274614
    Triangle and vertex normals and neighboring triangles...[done]
    Vertex neighbors...[done]
    Distances between neighboring vertices...[61440 distances done]
Mapping rh tc_120199 -> ico (5) ...[done]
Source space vertex moved from 57859 to 55128 because of double occupation.
Source space vertex moved from 57859 to 52619 because of double occupation.
Source space vertex moved from 55128 to 52611 because of double occupation.
Source space vertex moved from 52619 to 57845 because of double occupation.
Source space vertex moved from 57845 to 57835 because of double occupation.
Source space vertex moved from 57835 to 57846 because of double occupation.
Source space vertex moved from 57860 to 59133 because of double occupation.
Source space vertex moved from 59133 to 60383 because of double occupation.
Source space vertex moved from 60383 to 59154 because of double occupation.
Source space vertex moved from 52619 to 53812 because of double occupation.
vertex 57859 is in the map multiple times.
Cannot continue
Source space creation failed
Temporary files removed.
---------------------------------------------



I saw that this problem has been reported before (see this
thread<https://mail.nmr.mgh.harvard.edu/pipermail//mne_analysis/2011-November/000837.html>from
November 2011).
I tried as suggested by Alex to use the -ico -6 option and it works
perfectlly well.The problem with that solution is that I want to work with
the FreeSurfer average brain, all the other subjects have been processed
with the ico 5 option.

So here are my questions :
Does it make sense at all to work on an fsaverage brain if the number of
the sources are not the same across subjects?
It is said in the previous thread that this a known problem, and that it is
caused by "some safety checks run by MNE". Is there any way to bypass these
sanity checks?


Many thanks,

Lucille Lecoutre
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