Hi,
I have generated two different functional connectivity maps for two different ROI-based seeds. These maps are based on group-average of the same subjects (generated by using separate isxconcat-sess commands ), and now I want to see the difference map. To do so, I used mris_calc as below.
mris_calc -o diff_map/rh.ces.nii map1/rh.ces.nii sub map2/rh.ces.nii
Also, to generate the rh.cesvar.nii file I used this command:
mris_calc -o diff_map1/rh.cesvar.nii map1/rh.cesvar.nii sub
map2/rh.cesvar.nii
But then when I used the glmfit with WLS option as below:
mri_glmfit --y rh.ces.nii --osgm --glmdir rh.ffx.osgm.wls --nii --mask
../rh.mask.nii --yffxvar rh.cesvar.nii --ffxdofdat ../ffxdof.dat --surf fsaverage rh --wls rh.cesvar.nii
I faced an error saying: "Error: MRInormWeights: values less than or eq to 0" which I assumed is related to an error in rh.cesvar.nii file (am I right?). Would you tell me how can I fix this problem?
P.S.: please note that sequence of subjects and all MRI parameters are exactly the same between the two maps.