[FieldTrip] MNE surface data: normalising and averaging?

["Jörn M. Horschig"]

Hi Gregor,

would there be any reason why the following approach might not work?
http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space?s[]=warp

The specific steps are in more detail explained in this (new) tutorial:
http://fieldtrip.fcdonders.nl/development/beamformingextended

Best,
Jörn

On 3/4/2013 6:45 PM, Gregor Volberg wrote:
> Dear Fieldtrippers,
> I need to ask for a helpful hint on MNE source reconstructions. 
> Following this tutorial 
> http://fieldtrip.fcdonders.nl/tutorial/minimumnormestimate I obtained 
> nice individual cortical meshes and source points; the MNE forward and 
> inverse solution for the individuals all work well. I would now like 
> to normalize the individual grids to a template brain in order to do 
> statistics and averaging for plotting. I figured out that I could use 
> ft_sourceinterpolate to tranform the grid into a volumetric 
> representation, and then use ft_volumenormalise to normalise to a 
> standard brain.  But this did not work too well for source structures 
> containing time series (like 'mne'-stcutures) where the computational 
> load gets very high. I also tried to use a grid of one subject as a 
> template for the other subject's grids with ft_sourceinterpolate and 
> cfg.interpmethod = 'smudge', but this seems to require two grids with 
> the same number of source points as input(?).
> Is there a way to do a normalisation directly on brain triangulations 
> / source grids ? Thanks for any help!
> Best regards,
> Gregor
> -- 
> Dr. rer. nat. Gregor Volberg 
> <gregor.volberg at psychologie.uni-regensburg.de 
> <mailto:gregor.volberg at psychologie.uni-regensburg.de>> ( 
> mailto:gregor.volberg at psychologie.uni-regensburg.de )
> University of Regensburg
> Institute for Experimental Psychology
> 93040 Regensburg, Germany
> Tel: +49 941 943 3862
> Fax: +49 941 943 3233
> http://www.psychologie.uni-regensburg.de/Greenlee/team/volberg/volberg.html
>
>
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-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
FieldTrip Development Team

P.O. Box 9101
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The Netherlands

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