afni.nimh.nih.gov

That boundary is blurry. The 'within' AFNI method of creating
RETROICOR regressors is a matlab program written by Ziad.
That is currently the only way to create the regressors in AFNI.

Can the spiral data be stored in AFNI format as if it were an EPI
time series? If so, afni_proc.py should work with it.

You can have afni_proc.py do it after volreg, but it won't be happy. :)

- rick