Problems with plotting sourcestatistic s (partially) solved

Michael Wibral michael.wibral at WEB.DE
Tue Oct 30 17:17:28 CET 2007


Dear Ingrid,

thanks for your quick reply, I'll try the inverse inward-shift and post whther it solved the problem.

Michael
 
> -----Ursprüngliche Nachricht-----
> Von: FieldTrip discussion list <FIELDTRIP at NIC.SURFNET.NL>
> Gesendet: 30.10.07 15:50:10
> An: FIELDTRIP at NIC.SURFNET.NL
> Betreff: Re: [FIELDTRIP] Problems with plotting sourcestatistics (partially) solved


> 
> Dear Micheal,
> 
> You could try cfg.inwardshift = -1.5; when you do prepare_leadfield. This
> makes that the "inside" field becomes larger (negative inside shift is
> actually an outward shift). Plotting of the grid to see if everything went
> okay is recommended. This should make the inside of the data coming out of
> sourcegrandaverage also larger, since that function only uses the voxels
> present in the inside of all subjects. It worked for me.
> 
> Good luck,
> Ingrid
> 
> 
> -----Original Message-----
> From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
> Of Michael Wibral
> Sent: Tuesday, October 30, 2007 2:11 PM
> To: FIELDTRIP at NIC.SURFNET.NL
> Subject: [FIELDTRIP] Problems with plotting sourcestatistics (partially)
> solved
> 
> Dear Fieldtrippers,
> 
> a while ago I posted to this list about some problems with plotting
> sourcestatistics for multiple subjects. That problem is solved by now,
> fortunately - the plotting routine after sourcestatistics simply needed an
> additional cfg.sourceunits='mm' although I do not get exactly where this
> information got lost on the way. The other problem I have now is that,
> despite (nonlinear) volume-normalisation the brains of my subjects do not
> seem to share too many voxels, i.e. the ".inside" field of
> sourcegrandaverage
> is pretty small. Even if I fake perfectly matching subjects by feeding the
> same subject 10 times the area used for the statistics is considerably
> smaller than the brain in the template MRI.
> Any idea what could be wrong? I made grid and hdm for the individual
> subjects as described in the tutorial and used Guido Noltes hdm - is that
> too spherical, possibly?? my result are especially "brain deficient" at the
> occipital pole.
> 
> Thanks for your help,
> Michael Wibral
> 
> ----------------------------------
> The aim of this list is to facilitate the discussion between users of the
> FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG
> and EEG analysis. See also
> http://listserv.surfnet.nl/archives/fieldtrip.html and
> http://www.ru.nl/fcdonders/fieldtrip.
> 
> ----------------------------------
> The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/fcdonders/fieldtrip.
> 



----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/fcdonders/fieldtrip.
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