[Mne_analysis] Identifying adjacent sources

Stephen Politzer-Ahles politzerahless at gmail.com
Sat May 11 04:02:28 EDT 2013
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Is there a straighforward method to figure out, for any cortical source or
vertex, what the adjacent cortical sources/vertices are?

More specifically, I have extracted .amp timecourse files for each
participant and condition that look something like this:
    100779 9.76119e-13 9.8006e-13 1.01097e-12 1.0584e-12
    102810 5.77402e-13 4.74985e-13 6.13183e-13 8.53066e-13
    103338 7.69642e-13 1.13359e-12 1.48948e-12 1.78157e-12
    103374 6.44688e-13 8.72736e-13 1.09166e-12 1.24282e-12
where the first number in each row is the vertex that timecourse comes from
(and the following columns are the current estimates at each timepoint).
I'm interested in doing a permutation-based spatiotemporal clustering test,
so what I'd like to be able to do is, for each of those vertices, to get a
list of which sources are adjacent to it. (Not necessarily which vertices
are adjacent to it, since my understanding is that the cortical sources
represent just a subset of the vertices present in the original
tesselation.) I assume that after triangulation there must be some record
of this, or some way to find it out, but I can't figure out where to find
it. By the way, my structural images were segmented in Freesurfer, so the
triangulations are in .surf files rather than .tri files.

Any advice is greatly appreciated! Thank you,
Steve Politzer-Ahles

Stephen Politzer-Ahles
University of Kansas
Linguistics Department
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