afni.nimh.nih.gov

> My experiment has 9 different conditions, let's say it's a1, a2, ... a9

Suppose that the labels for those 9 conditions are a1, a2, ..., a9. In your 3dDeconvolve script, add something like

-gltsym 'SYM: +a1 -a2 \ +a2 -a3 \ +a3 -a4 \ +a4 -a5 \ +a5 -a6 \ +a6 -a7 \ +a7 -a8 \ +a8 -a9'
-fout -tout

Gang