Distinguished everyone,
I am an abecedarian in analyzing FMRI data with SPM. I am specifying the 1st-level test. Among the parameters, there is "masking threshold” set to be 0.8 in default. Sometimes I cannot get any voxels because 0.8 is too high. I check the SPM archives and find that the 0.8 is an empirical value. I don't know how to set it properly in my data. Instead, I could import an explicit mask. My data has been normalized into MNI template. So, can I just import a mask of MNI template which only overlaying the brain? If I can, how or where could I get a MNI brain mask?
Thank you.
Bests.
Zhang Wei
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