How can I FDR correct painted surface significance maps when I have no talraich .xfm file and no cortical segmentation?

Thanks again,

Clark

Hi Freesurfers,

I have another monkey-specific question.  I'd like to output FDR-corrected 
signficance surface maps for my monkey data, or at least FDR-threshold the 
maps.  It seems like mri_surfcluster might be one way to go about this however:
        1) I don't have any .xfm files for my monkeys, as I'm working in native 
space, and
        2) Without segmentation, I don't have a good mask to use for the cortex 
only. 

My first attempts at work-arounds would be:
        1)Try to create an identity .xfm file
        2)Use the cortical ribbons from mris_volmask as a cortex mask

Should these work?  If so, how should I make an identity .xfm file?  If not, is 
there another way to FDR correct my surface data?

Thanks,
Clark
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