[Eeglablist] How to convert EEGlab real coordinate system to MNI coordinate system

[Jody Zhou]

Hi Arno,

By following this, I got this error message by EEGlab:
https://drive.google.com/file/d/1U72S1x_iVwsqi2MucvMaNsHfy_lw9itd/view?usp=sharing
  (Invalid file identifier. Use fopen to generate a valid file identifier
)  no matter I click the  "export channel label only" or not.

Do you have any idea of what's not working? Thanks!

Best
Jody




On Tue, Oct 2, 2018 at 3:09 PM Arnaud Delorme <arno at ucsd.edu> wrote:

> Hi Jody,
>
> Make sure you uncheck the checkbox “Export label only” otherwise the
> plugin will not export coordinates. It will export the channel labels which
> Loreta cannot recognize. If you uncheck the checkbox then it will export
> your channel coordinates in the MNI space.
>
> Best wishes,
>
> Arno
>
> > On Oct 2, 2018, at 1:53 PM, Jody Zhou <jodzhou at ucdavis.edu> wrote:
> >
> > Hi Arno,
> >
> > Thanks for the video. I tried the plugin. However, because the GSN 129
> electrode coordinate is not based on the 10-10 system or 10-20 pr 10-5
> system,  the list of the electrode label doesn't match to any of the
> Talairach label used in LORETA.  I think the coordinate I have is real
> coordinate, so I also tried the "electrode coordinates maker" (in Talairach
> space) based on extended 10/10 system template. However it requires Nasion,
> Inion, left pre-auricular and right pre-auricular  fiducials' location but
> the GSN electrode coordinate only contains the three of the four fiducials
> not the Inion.
> >
> > Here is the sfp file including just Cartesian coordinate but for all the
> 128 electrodes and the three fiducials (Nz,Left-auricular(T9) and
> right-auricular(T10)).
> >
> https://drive.google.com/file/d/1UoHU1dVYP76Kmu-PCCpoBwvlHQr07KI8/view?usp=sharing
> >
> > I've read some tutorial for alignment and co-registering. Is that what I
> should try?
> >
> > Best
> > Jody
> >
> > On Tue, Oct 2, 2018 at 10:35 AM Arnaud Delorme <arno at ucsd.edu> wrote:
> > Hi Jody,
> >
> > This is a relevant question. If you are using the Loreta 2.0 plugin in
> EEGLAB, it will convert your electrode coordinates to MNI. This plugin was
> made to export ICA components, but you can replace the content in the text
> files generated (comp1.txt etc…) by your ERD activity across channels. See
> this video for a tutorial.
> >
> > https://www.youtube.com/watch?v=amttvN_Sb6A
> >
> > Best wishes,
> >
> > Arno
> >
> > > On Oct 1, 2018, at 2:54 PM, Jody Zhou <jodzhou at ucdavis.edu> wrote:
> > >
> > > Hi all,
> > >
> > > I want to use sLORETA to conduct source localization of ERD. However,
> the electrode coordinate template that I use ( the old GSN 129 electrode
> coordinate)
> > >  has a different electrode coordinate system (different origin,
> different spherical direction and organization) than the MNI coordinate
> system sLORETA uses. So I'm wondering how to convert this coordinate file
> to MNI coordinate system. Thanks!
> > >
> > > Here I link the GSN 129 electrode coordinate elements including the
> real spherical and cartesian coordinate:
> > >
> > >
> https://drive.google.com/file/d/1tI6QWySUDjCC3BoYhE1Hfny2zPnEjpq7/view?usp=sharing
> > >
> > > Best
> > > Jody
> > >
> > >
> > > Best
> > > Jody
> > >
> > >
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>
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