> I am using 3dregana to look at the relationship between behavior and
> connectivity with two covariates (model 3 : 0 1 2). When examining
> results in afni, what should I select in overlay and threshold windows
> (F stat regression, coef #3 t-test)?
Without knowing the details of your model (and the script), it's hard to answer your question. In addition, it's not clear to me what effect are you trying to view on the AFNI interface.
I recommend that you instead use 3dttest++ or 3dMEMA for this type of analysis.
Gang