[Mne_analysis] vertex coordinates

[Rezvan Farahi]

Thanks a lot Dan, very helpful suggestions.

On Fri, Jan 8, 2016 at 1:02 AM, dgw <dgwakeman at gmail.com> wrote:

> I would recommend another technique for a couple of reasons:
>
> 1. The numbering system only has a rough correspondence for many
> vertices and can be wildly off for others. (which makes that more
> difficult)
>
> 2. actually calculating a fit that makes sense is extremely difficult
> and is exactly what FreeSurfer is designed to do, which is what the
> purpose of the morphing options in mne are designed to take advantage of.
>
> So experimenters can morph to an individual (either from your experiment
> or fsaverage, or an average from your experiment). Then extract the data
> from similar labels in the annotations.
>
>
> If those don't fit your needs and the experimenter truly wants the
> contralateral non-functionally defined region (this is very specific to
> the region and reasons that the experimenter is interested in it), then
> look into the xhemi work (Doug Greve is the major developer of it) found
> here:
> http://surfer.nmr.mgh.harvard.edu/fswiki/Xhemi
>
> This page has a link to the paper which should be read.
>
> Note, that there is a separate fsaverage_sym which is different from
> fsaverage (this may mean it is not safe to assume the numbering is
> symmetrical, though this would be a question for the freesurfer list). I
> think if you want true symmetry between the surfaces this is the
> technique to apply. Think carefully though before going down this road:
> real brains are not symmetrical, so in many cases it will not make sense
> to head down that road.
>
> hth
> d
>
>
>
> On 1/7/16 7:21 PM, Rezvan Farahi wrote:
> > Yes, absolutely not for single subjects; there the numbering is in the
> > original space and not in the downsampled space and not equal number of
> > vertices for the two hemispheres.
> > For the stc files defined in the downsampled space there seems to be a
> > rough correspondence.
> > Is there a way I can accurately find the mirror vertices?
> >
> > Thanks,
> > Rezvan
> >
> >
> > On Fri, Jan 8, 2016 at 12:15 AM, dgw <dgwakeman at gmail.com
> > <mailto:dgwakeman at gmail.com>> wrote:
> >
> >     It is important to note: while this may be true for fsaverage (I
> haven't
> >     done a check of this) it is definitely NOT true for any individual
> >     participant's brain.
> >
> >     hth
> >     d
> >
> >     On 1/7/16 7:12 PM, Rezvan Farahi wrote:
> >     > Sorry, my bad, sorted. the location for 0 does pair with 10242, 1
> with
> >     > 10243 and so on... thought had checked this before.
> >     >
> >     > On Thu, Jan 7, 2016 at 11:48 PM, Rezvan Farahi <
> rezvan.farahi at gmail.com <mailto:rezvan.farahi at gmail.com>
> >     > <mailto:rezvan.farahi at gmail.com <mailto:rezvan.farahi at gmail.com>>>
> wrote:
> >     >
> >     >     Hi all,
> >     >     I was wondering, for source estimates in the fsaverage space,
> is
> >     >     there a quick way of determining the mirror vertices
> bilaterally?
> >     >     (e.g.vertex 0 is in the left hemisphere, what's the opposite
> in the
> >     >     right?)
> >     >     Sorry if it's explained somewhere in the tutorials, hadn't
> come across.
> >     >
> >     >     Many thanks,
> >     >     Rezvan
> >     >
> >     >
> >     >
> >     >
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