Print

---

Hi Vladimir,
That does the trick.  Thanks!
Yes, I just checked and I am using the most recent update.

Tony



On Thu, Mar 24, 2011 at 3:18 PM, Vladimir Litvak
<[log in to unmask]>wrote:

> Dear Tony,
>
> If you do:
>
> D = spm_eeg_load;
> D = sensors(D, 'EEG', []);
> save(D);
>
> That should fix it. I've seen this problem before and I thought I
> fixed it, but I'll check again. Are you using the latest SPM update?
>
> Vladimir
>
>
>
> On 24 Mar 2011, at 17:45, "Tony W. Wilson" <[log in to unmask]>
> wrote:
>
> > Dear SPMers,
> > We are having a problem converting fif files that contain "false" EEG
> channels.  Essentially, a few paradigms on the MEG acquisition computer are
> set to record EEG+MEG, but we do not always acquire the EEG because of
> time/subject/etc limitations.  With these files, the EEG channels are
> sampled all same and included in the raw fif file, but the values are just
> noise.  When we convert these using SPM8 (with MNE 2.7.0 toolbox), all
> appears well regardless of whether we import all the channels (stimulus,
> EEG, MEG) or just the MEG channels.  However, there seems to be some sort of
> EEG flag that becomes embedded in the parameters file and creates problems
> later on.  For example, in the case where we import all channels, we can
> declare all non-MEG channels as "Other" and then save in the "prepare" menu.
> However, once it is time to calculate a forward model, the 3D source
> localization gui still cues for an EEG model.  If we select the BEM option
> and single shell (MEG), then we get the 'no good EEG channels' error message
> on the inversion - even though the gui reflects only MEG channels as
> available for this inversion.  The same scenario happens when we import only
> the MEG channels during the conversion from fif.  Furthermore, in the
> MEG-only import case, all the options for adjusting EEG electrodes remain in
> the "prepare" menus, which is not the case in true MEG only fiff files.
> >
> > In fif files without false EEG, we do not have any of these issues.
> >
> > I have searched the archives pretty well and have not seen a similar
> problem. We have seen this on Win-64 and CentOS 32-bit machines (both
> running current SPM8).  Any thoughts on a fix for the false EEG files?
> >
> > Thanks in advance,
> >
> > Tony Wilson
> >
> >
> >
>