Hi,

In order to have a direct comparison between 2 tasks (A and B), I entered task A as the baseline and looked at the brick comparing task B to the baseline (which in fact was comparing it to task A).

This worked well for individual subjects but now I am not sure how to look at this comparison for the group. This is because for each subject I have just one file (a brick comparing task A to task B), but in order to use 3dANOVA I need at least 2 files per subject. It also doesn't look like one-sample ttest would solve my problem since I don't want to choose the "bval" but to use the "baseline" (in actual fact, task A's) values.

3dANOVA outputs a tstat for each condition in addition to outputing comparisons, which looks like what I need. In other words, I am looking for a way to have a mean and a statistic for each voxel, across all subjects, looking for significant differences is between task A and B (without taking any other "baseline" into consideration).

Thanks for your time.
Deborah