Hi,
> I have one more question : I plan to draw 21 ROI's (one for each
> patient) and obtain the % signal change values for each patient and then
> average the values to obtain a single hrf curve for the group.
> Just to make things a lot simpler is it possible to use a group average
> design matrix from SPM with the ROI drawn on the group averaged anatomy
> images and then obtain the % signal change for the group.
No - you will need the single-subject design matrices to estimate the
hrfs for each subject I'm afraid.
Best,
Matthew
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