Hi, I am trying to run mri_volcluster on a group ROI and am having some trouble. I was hoping someone had suggestion. I created individual ROIs and wanted to average them to obtain a group ROI. I ran isxavg-re-sess for each ROI but there is no registration file for mri_volcuster to reference. Have I hit a dead end? Does anyone know another way of creating a group ROI that I can apply the mri_volcluster command to? Thanks, Cameron