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Hi expert,
I found an issue when I do skull stripping. I used the following command line.
recon-all \
-skullstrip \
-s fs_output \
-clean-bm \
-wsthresh 100
But, I found too much brain tissue has been removed, particularly for the visual and motor cortex, please see below.

Do you have any thoughts about this issue? Even though I tried wsthresh=100, it's still not working. I am not sure how I can include more brain tissues. 
Looking forward to your reply. Thanks.
Best,
Cain