Dear AFNI experts,
After preprocessing, I'm running 2 seed based correlations with resting state data in parallel to obtain correlation maps of the 2 groups of my experiment. Afterwards, I want to understand whether these two maps (obtianined with the same seed) are significantly different between the two groups. I use:
3dttest++ -prefix blabla.nii -setA group1/*.nii -setB group2/*.nii
3dcalc -a blabla.nii[0] -expr a -prefix map_mean.nii
Is it correct?
If so, why if I reverse group A and B
3dttest++ -prefix blabla.nii -setB group1/*.nii -setA group2/*.nii
3dcalc -a blabla.nii[0] -expr a -prefix map_mean.nii
I obtain different results/maps?
Thanks for your support.
