Hi, Sondos-
Output text files of properties are "*.grid" files; please search for "grid" in the 3dTrackID help file for more information, and also in this online documentation for more description:
[
afni.nimh.nih.gov]
For more information on the tracking functions and how they work, please see this documentation:
[
afni.nimh.nih.gov]
For probabilistic tracking "WM ROIs" or "WM connections (WMCs)" need not be contiguous.
What determines whether a voxel is "in" a WMC between a given pair of targets (say, A and B) is purely: is the number of tracts between A and B that run through the voxel greater than the threshold value? Each voxel is tested independently according to that criterion. It is possible that WM ROIs can be "patchy".
Note that I don't htink looking at the PAIRMAP is as informative as looking at the set of individual connections, as described here:
[
afni.nimh.nih.gov]
since in the PAIRMAP file, there is less specificity, in general.
--pt
