Hi Jun,
If you have already run the full process, then
it is enough to use the existing results. Since
'NF -F' is the negative as 'F -NF', anywhere that
F_vs_NF is positive means F is greater, while the
negatives are where NF is greater. The NF_vs_F
contrast will just reverse that.
But if you wnat to run it, it is okay to put both
GLTs in the command (the second one gets label 2):
-regress_stim_labels F NF \
-regress_basis 'BLOCK(4,1)' \
-regress_censor_motion 0.3 \
-regress_opts_3dD \
-gltsym 'SYM: +F -NF' \
-glt_label 1 F_vs_NF \
-gltsym 'SYM: NF -F' \
-glt_label 2 NF_vs_F \
- rick