[Mne_analysis] morph maps, vertex missing/mismatch

Alexandre Gramfort alexandre.gramfort at telecom-paristech.fr
Fri Jan 13 04:10:52 EST 2017
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hi Bjorn,

I see 2 possible problems:

- 0 vs 1 indexing in matlab
- use of mindist in source space building

but maybe it's something else...

Alex




On Thu, Jan 12, 2017 at 8:09 PM, Björn Herrmann <herrmann.b at gmail.com> wrote:
> Dear list,
>
> I was wondering whether someone has advice on a problem I encountered.
> I use the morph maps in matlab to morph brain activity from one
> individual to another brain.
>
> I calculate the morph maps in the linux shell:
> mne_make_morph_maps --from subjID --to fsurfavr
>
> that works all fine, but when I open the morph maps in matlab
> (mne_read_morph_map), then in a handful of my subjects, the number of
> vertices of the source subject is one to small. The source space
> (mne_read_source_spaces) of that individual shows the correct number
> of vertices. Also the output in the linux shell while the morph map is
> calculated shows the right number of vertices.
>
> When I morph the individuals brain (subjID above) to a different brain
> (not the freesurfer standard brain) then it might work properly with
> the correct number of vertices for this subject in the morph map
> matrix, but not for others. It seems to be a specific interaction
> between source and target brain whether one vertex (so far it was
> always just one) cannot not be properly morphed and just gets dropped.
>
> Has someone encountered this problem before and is there a way to
> solve it. I currently cannot morph a handful of participants to a
> common brain space.
>
> Thank you in advance for any input you may have,
> Cheers,
>
> Bjorn
>
>
>
> ----------
> Björn Herrmann
>
> Brain and Mind Institute
> The University of Western Ontario
> London, Ontario N6A 5B7
> Canada
>
> email: herrmann.b at gmail.com
> web: www.bjoernherrmann.com
>
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