afni.nimh.nih.gov

Hi everyone,

I was hoping I can get some clarification on two things.

First is: I was taking a look at the output "PAIRMAP" after running 3dtrackID -mode prob
and I noticed that the tracts are not necessarily continuous and connected between a pair of ROI's.
I've attached an image of what I mean. Is this normal? I thought the way probabilistic tractography works is that it only include a single path (the more likely path) and does not include any paths that may deviate away from that and end at a random spot.

Second: Also, can I get the connectivity values between pairs of ROIs (from probabilistic tractography)? Which file is that? I tried to open the file ending in "PAIRMAP.niml.lt" but that doesn't seem to be the correct file. I'm only asking so I can perform statistical analysis on it.

Any help would be appreciated.