afni.nimh.nih.gov

> Does anyone know how to extract the effect of 'after-before' in anode for each individual in the current model?

By "anode" do you mean a voxel or an anatomically or statistically defined region? First, define your voxel coordinates or a mask for the region, then extract the values from each subject using 3dmaskdump -xbox (or -ibox) or 3dmaskave -mask

Gang