I need some help regarding my FA and non-FA group analysis study. I am not using tracula. I used the dt_recon and I have done the registration for my FA data on the cvs space using the mri_cvs_register.  I used the GLM group analysis method after I concatenate FA from individuals into one file and used mri_glmfit-sim with the option grf as you recommended me some time ago:

 mri_glmfit-sim \
   --glmdir Group_Analysis.glmdir \
   --grf 2 neg \
   --cwpvalthresh .025 \
   --overwrite
 
 to cache the significant clusters after multiple comparisons so I have the uncorrected and corrected significant map but I don't know how I can see if  my FA is increasing or decreasing in controls
 group versus patients group.
 

I will appreciate any help/suggestion.

 Thank you.
 Antonella