Is there some sort of group masking that is relevant here? The dark (higher magnitude) area looks a bit like a coverage intersection box. Are various subjects missing from coverage outside of that? Do you have a group mask? Do you have a group 'sum' mask (add up subjects per voxel)?
EDIT: For reference, it is nice to run something like:
3dMean -prefix QC/mask.mean sub*/*.results/mask_epi_anat*.HEAD
Which is part of the group QC we were using (a few years back) in
AFNI_demos/AFNI_pamenc/AFNI_02_pamenc/global_process_outline.txt
- rick
Edited 1 time(s). Last edit at 03/01/2023 06:07PM by rick reynolds.