Hi FreeSurfers,
I'm running a group-level analysis of the fMRI data (beta-maps of individual
subjects normalized onto fsaverage). One example would be like:
mri_glmfit --y grouprfx/lh.con_0001.norm.mgh --surf fsaverage lh \
--glmdir grouprfx/lh.con_0001.osgm --osgm
I understand that this is simply performing a one-sample t-test on each
vertex. However, the resulting image (lh.con_0001.osgm/osgm/sig.mgh)
contains some values that are extremely high or low (1e11 or 1e-11). I guess
this is a representation of Inf and -Inf, but this is strange because when I
run one-sample t-test manually in Matlab, the resulting t-values should be
within an interpretable range. I have many subjects (close to 250), but I
don't think that should be the reason.
Any clues on why this is happening and how to resolve it?
Thanks in advance as always!
Joon
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