I would like to examine the PSC difference in certain areas of two groups
during an fMRI task.
Normally I would create ROIs based on the whole group brain activity
resulting from the SPM fMRI analysis and extract PSC.
In this case, however, I have two groups which show activations in almost
the same area but not the same clustersize.
Can I create different ROIs (e.g. in the same area but with different size)
for each group (based on their group activation), extract PSC and then
compare PSCs to each other?
Or is it nessesary to build the same ROI for both groups (say a ROI which
includes the activated areas of both groups) in order to compare PSCs?
Can you recommend papers which discuss this question?
Thank you very much for your help!
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