Dear SPM experts,
After searching the archive I still
have 3 questions about SPM's default masking threshold. I apologize
if these are naive questions, but I hope someone can answer them.
1) Why is the default masking
threshold value set at 0.8 (i.e defaults.mask.thresh = 0.8)? Is there
a significance to the value 0.8?
2) Is there a down-side
to lowering this threshold (other than including voxels with low/noisy
signal and voxels that are not part of the brain)?
3) Is there a minimum threshold
value that would still yield principled results?
Any information would be greatly appreciated.
Staff Research Associate I
Department of Psychiatry and Behavioral Sciences
U.C. Davis Medical Center
2825 50th Street
Sacramento, CA 95817
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