Dear Freesurfer Experts,

I would appreciate your help. I will explain first what I have done and where my problem is.

I want to measure the cortical thickness in stroke patients. Therefore I followed Douglas' instructions provided in this link to join both affected hemispheres (left or right, depending on the patient) and to analyze them with xhemi.

After mri_glmfit and mri_glmfit-sim (--cwpvalthresh 0,05 --cache 4 abs/neg) have run I obtained 2 significant clusters. One in the precentral area, which I am interested in. When I check the *abs/neg.y.ocn.dat file the values are all -0.XXXX. If I understood it correctly, those should be cortical thickness values in mm, making those values implausible. For that reason I made a label of that cluster using the autofill option from tksurfer. The idea was to obtain the mean cortical thickness using mris_anatomical_stats after mapping the label to the subjects.

Now my questions, what would be the best method to map the label created from the fsaverage_sym space to the subject space? Or just simply, is this the right way to do this? or should I check why I am obtaining those values in the *y.ocn.dat file?

Thanks in advance.

Kind Regards

José Graterol