Hi,
I am struggling to identify what is the best mask to use at the first level.
In my opinion, I would say it is better to use an explicit mask containing only grey matter.
However as some prefontal, temporal and cerebellar regions are subject to signal dropout, I think it would be good to exludes these voxels by applying a small implicit masking threshold around 0.2 or 0.4 (this needs to be define after testing).
Is it a good idea or am I doing something totally wrong that could severly affect my result ?
Best,
Simon
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