Dear Sophie,
It looks like a bug that was recently fixed. It doesn't necessarily have to do with ICA. I would suggest you to try the next SPM8 update when it comes out (should be really soon). You might have to re-read your sensor representation using 'Copy MEG sensors' in MEEGtools and then project your channel positions to 3D again using 'Prepare'.
Best,
Vladimir
On 9 Jan 2013, at 16:04, Sophie Galer <[log in to unmask]> wrote:
>
> Dear SPM experts,
> I have applied ICA to my MEG data to remove blink artefacts.
> The ICA transformation is executed at the last step of the preprocessing.
> We used spm_eeg_montage.
>
> The processus is working but when i looked at the topo plot of one trial (trial i knew
> was contamined by a blink) via the display of the GUI, i get an error (see below) and the image is not normal (see attached).
>
> Warning: Duplicate x-y data points detected: using average of the z values.
> > In griddata at 105
> > In spm_eeg_plotScalpData>doChangeTime at 248
>
> Does anyone know where the problem come from?
>
>
> Thank you very much for your answer,
> --
> Sophie Galer - Ph.D. student
> National Fund for Scientific Research (F.R.S - FNRS)
> Université Libre de Bruxelles
> LCFC-UR2NF
> +322/555.42.98
> +322/650.42.62
> Hôpital Erasme
> 808 route de Lennik
> B-1070 Brussels, Belgium
> <133_ICA.jpg>
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