I am using AFNI to calculate seed correlation (using instacorr); I get a map of the z-scored correlation difference between 2 groups.  I then convert this map to nifti to read it in FSLVIEW.  

However, the map range of values using fslstats -R   =  ( -4.973786 13.000000 ) is very different from the one I can visualize in FSLVIEW  which seems to be between -1 and 1.  

Can anybody tell me why I cannot see the same range of values that fslstats gives me when I open the image in FSLVIEW or suggest to  me a fix for this?

thanks a lot for your help!

Paul