[FieldTrip] Defining cfg.neighbourdist at source level

[Robert Oostenveld]

Dear Ulrich

If your source locations are defined on a regular 3D grid that can be represented as volume, then the neighbours are trivial to find and you do not have to specify a structure for the neighbours. 

If you have done source reconstruction on a 3D folded cortical sheet that is defined by a triangulated surface, then it is also possible to cluster along the surface. I don't know the details for the cortical sheet clustering from the top of my head, if you are interested please let me know and I'll look them up.  

best
Robert




On 30 Jan 2012, at 16:58, Pomper, Ulrich wrote:

> Dear Jörn,
> Thanks for you reply. I did mean source-level, so like you said, I am trying to define the neighbouring voxels for each voxel.
> As far as I understand, leaving cfg.neighbours blank means that the clustering is done over the time and frequency dimensions only, not over space. 
> The FT help reads: 
> %If you specify an empty neighbourhood structure, clustering will only be done in frequency and time (if available) and not over neighbouring channels.
> 
> Has anybody done clustering in source space using all three dimensions and could explain how this works?
> Cheers, 
> Ulrich
> 

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