Dear Panagiotis,
Try doing:
spm_eeg_load
D.coor2D(D.meegchannels('MEG'))
and look which of the channels have the same 2D coordinates. In
principle this should not happen for CTF MEG. You can also look in
'Prepare' tool at the 2D channel layout an modify it if necessary or
load a template layout from EEGtemplates.
Best,
Vladimir
On Sun, Feb 6, 2011 at 5:23 PM, Panagiotis Tsiatsis
<[log in to unmask]> wrote:
> Dear All,
>
> When I am converting my CTF MEG epoched data to images, I am getting the
> following warning:
>
> Warning: Duplicate x-y data points detected: using average of the z values.
>> In griddata at 107
> In spm_eeg_convert2scalp at 204
>
> My settings are:
>
> S = [];
> S.n = 32;
> S.Fname = Concatenated_File_Name_Time;
> S.interpolate_bad = 1;
> S.modality = 'MEG';
>
> I also have EOG channels whose chantype has been set to 'EEG' during the
> conversion (this of course should not interfere since I ve selected my
> modality to be 'MEG').
>
> By browsing the Mathwoks forum, I suspect that this happens when nearby
> values get very similar (as is the case with MEG data).
>
> Anybody seen that before? Any intuitions?
>
> Thanks and best,
> Panagiotis
>
>
> --
> Panagiotis S. Tsiatsis
> Max Planck Institute for Biological Cybernetics
> Cognitive NeuroImaging Group
> Tuebingen, Germany
>
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