Dear FSL users,
i completed a three level fMRI analysis using Feat (as part of FSL
3.3.7) comparing two groups of participants. The report file is at
http://web.mit.edu/paymon/www/report/report/report.html
C3 and C4 show the mean activations of each group, and C1 and C2 show
the difference in activation between the groups.
here is my question:
even though C3 and C4 are clearly different ( a lot more activation in
C4 as compared to C3), the difference maps (C1 and C2) show no
activation at all. In general, if the mean activations for two groups
are different, shouldn't one expect to see activation in the group
difference maps?
thanks a lot for any help,
Paymon
|