Dear Donald,
Thanks a lot. One more point.
If I identify region A and region B via Methods (1) (i.e., group-level correlation) and (3) (i.e., parametric modulation within each EV), respectively, is the significance different for both methods? I mean, although I can say regions A and B are decision-related regions, region A is associated with individual differences (i.e., between-subject effects) in difficulty levels, and region B is "truely" related to task difficulty for each subject (i.e., within-subject effects)?
Mike
|