Hello all, I see unexpected behavior when I use 'fslcc'. I get no output when I use the '--noabs' switch. I want to see if two eigenvariate time courses I extracted via 'fslmeants' are flipped with respect to one another. I extract the time courses: fslmeants -i filtered_func \ -m hippoLeft -o tc_eig_hippoLeft.txt --eig fslmeants -i filtered_func \ -m hippoRight -o tc_eig_hippoRight.txt --eig I convert these ascii files to .nii: nn=`fslnvols filtered_func ` fslascii2img tc_eig_hippoLeft.txt \ $nn 1 1 1 1 1 1 1 vol_eig_tc_eig_hippoLeft fslascii2img tc_eig_hippoRight.txt \ $nn 1 1 1 1 1 1 1 vol_mean_tc_eig_hippoRight Then compute the cross correlation without and with the --noabs switch: # without --abs switch fslcc -t 0 -p 6 vol_eig_tc_eig_hippoLeft vol_mean_tc_eig_hippoRight 1 1 0.838791 # with --abs switch fslcc --noabs -t 0 -p 6 vol_eig_tc_eig_hippoLeft vol_mean_tc_eig_hippoRight When I plot these two eigenvariates, I can see they are anti-correlated. In the above example, when using the --noabs switch I expected a negative value, -0.838791. Instead, I get no output. Just in case, I also tried --noabs=1 and --noabs=0 and got no output. I also moved the position of the --noabs switch within the command -- still no output. Any suggestions? I am trying to avoid popping into matlab. Thanks, * ba