I used 12 TENT functions (24 seconds). The stimulus lasts for 8 seconds. I wanted to capture what happens during the stimulus and after that. I can alter that though for sure. I could even consider a convolution (a priori HRF) approach, but I don't really know what the HRF will look like in this case.

In our lab we've done PSC calculations using similar approaches (if for shorter lengths of time) and just averaged the 3-4 betas (say between time 8 seconds and 12 seconds) where it looks like the response is greatest (after examining the iresps). We've never done an AUC - I just threw it out there to consider.

Yes, I plan to do a Group X Condition ANOVA at the group Level. Two groups, two conditions. Maybe a single voxelwise covariate (ASL) as well.

Thanks!