Dear Elia,
It might well be the case that SPM and EEGLAB do not represent
electrode locations in the same coordinate system so without doing
coregistration you will get the locations wrong in SPM. If these are
just default locations, the simplest thing to do is to set the sensor
locations to default in SPM via the 'Prepare' function. Note that you
should also re-create the 2D locations then by projecting EEG to 2D
and then doing Apply and Save in Prepare. If you want to keep the same
locations as in EEGLAB you should do coregistration also in Prepare
and then project to 2D. But you need to have 3 points that you can use
as fiducials and mark on the MRI.
Best,
Vladimir
On Tue, Jan 22, 2013 at 9:06 PM, Elia Valentini
<[log in to unmask]> wrote:
> Dear Vladimir,
>
> I'm trying to understand why the channel locations of my .set file imported
> in SPM are systematically shifted of 90°.
> I never used SPM but It looks like SPM reads the X+ coordinates like a Y+
> one.
> Attached you find two snapshots detailing the difference.
>
> I found nothing in the threads yet so I'm afraid is such a trivial thing
> that I did not want to go through the list.
> I tried to upload the default spm montages but I've got this error:
>
> ??? Error using ==> spm_eeg_load at 49
> F:\spm8\EEGtemplates\61channels.mat doesn't contain SPM M/EEG data
>
> Error in ==> spm_eeg_montage at 53
> D = spm_eeg_load(D);
>
> Error in ==> spm at 1015
> evalin('base',CB)
>
>
> Shall I detail a script to solve it?
>
> Thanks very much!
>
> elia
>
>
> Department of Psychology
> Sapienza University of Rome
> Via dei Marsi 78 - 00185 - Roma
> Phone: (+39) 06-49917635
> Fax: (+39) 06-49917635
>
> Web: http://w3.uniroma1.it/scnl/index.php/elia-valentini/
>
>
>
>
>
