I have a single seed to 7 targets. I am running probtrackx2 using the projection threshold option with a threshold of 1250. Now I get 7 seeds_to_target_proj_seg_thr files for each subject. My question is this:
1. Am I correct to interpret the values in these files as connection probability between each voxel in the seed to each of the targets?
2. Is it logical to average the values over all voxels of the seed using the fslmaths -M option to get an "average connection probability" of the entire seed?
3. Can the values be used to compare across subjects? That is, are they already normalized per subject using the waypoint number? That is, was this already incorporated into the projection threshold routine within probtrackx?
-AB
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