Dear SPM users,
I have been trying to correct for some signal drop out (holes in the brainmask.hdr that is outputted from first level model estimation) and can't seem to resolve the problem. My steps are the following
1. Created binary version of brainmask.nii image in apriori folder provided by spm8 using ImCalc with a threshold of -infinity
2. Included this mask under the explicit mask option and ran first level model estimation again
As I understand it, with a mask that was binarised to negative infinity, there shouldn't be any voxels left out since it is such a liberal threshold. However, there are still holes (I'm assuming because of signal dropout) in the OFC and other areas. Any help/direction would be greatly appreciated.
Cheers,
Devin Sodums
Research Assistant, Cognitive Neuroscience Unit
Montreal Neurological Institute
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