Hi Ariel,
With a single value per subject to correlate with, it
seems appropriate to use 3dttest++ with a covariate.
Of course, that should not give a different picture from
the correlation, but it is a more typical use.
It is not clear what you might mean to do to get single
subject results. Is that a goal?
It is also not clear what might come from getting peaks
as you mentioned. That sounds a little circular, but I may
not be understanding what you want to show.
- rick