Hi,
I used spm8 to analyze fMRI data. After preprocessing, first-level model estimation and contrast setting, I used an uncorrected threshold of p = 1 to let all voxels "activated", and, as expected, I found that each subject's fMRI data completely cover the whole brain.
However, for the group contrast (one-sample t-test to see group mean activation), I also used an uncorrected threshold of p = 1, but I found that the whole brain was not completely covered, although the group activation pattern was nice (see attached figure).
Does anyone know why?
Thanks. Mike
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