afni.nimh.nih.gov

I should have looked further before responding.

You also have a problem with your GLTs. The double bracket
encoding makes no sense in your case because (when using
BLOCK()), each stimulus class has only 1 regressor. That
format would be more appropriate for TENTs (or the old 'lags').

Would you describe the intention of your GLTs? If you just
want a simple difference, then use 'SYM: A -B' for example.

- rick