Hi Aral,
I expect you have seen to open the resulting volume
in afni, or any other image viewer.
To get the average, you could use 3dmaskave. But for
that, you don't even need the mask. As is done by
afni_proc.py:
3dTstat -sos -prefix - brain.mean.1D \' > out.gcor.1D
The result is that global correlation value, the average
correlation of every pair of (masked) voxels.
Or, to use your 3dTcorr1D result:
3dmaskave -quiet -mask BRAIN_MASK.hdr mean.brain.corr.nii
- rick
