Your covariate 'Perf' does not vary across voxels, so it's not a voxel-wise covariate. Just use -qVars instead of -vVars in 3dMVM. If you've set the 3dRegAna script properly, I don't see any problem with your 3dRegAna result: you may explore further the stuff outside of the brain, but I would not worry too much about it. Use a mask to hide the stuff outside of the brian if you're concerned about its cosmetic effect.
Alternatively 3dttest++ is a better choice for this scenario because it has the updated approach to handling FWE correction.
Gang
Edited 1 time(s). Last edit at 10/25/2016 12:50PM by Gang.
