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Looks like, it the output of that command is `diffcount 0`.

If you binary-diff them you see some differences near the start, but that's most likely just header info like creation time or something.

Ok, that answers my question. Thanks for your help!

Tim

On October 10, 2018 at 8:13 PM "Greve, Douglas N.,Ph.D." DGREVE@mgh.harvard.edu wrote:

I think they are probably the same thing. Can you run mri_diff lh.area.fsaverage.mgh lh.area.fwhm0.fsaverage.mgh

On 10/10/2018 11:12 AM, ts+ml@rcmd.org wrote:

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Dear FreeSurfer experts,

what is the difference between the following 2 files found in a subject's surf/ directory:

• file #1: lh.area.fsaverage.mgh
• file #2: lh.area.fwhm0.fsaverage.mgh

I see in the logs (<SUBJECT>/scripts/recon-all.log), that file #2 is generated from file #1 by running the following command:

 mri_surf2surf --prune --s fsaverage --hemi lh --fwhm 0 --sval lh.area.fsaverage.mgh --tval lh.area.fwhm0.fsaverage.mgh --cortex

I know that if fwhm > 0, spatial smoothing will be applied. But what happens if fwhm is 0? From a quick comparison of the data in both files, they seem to be identical, but the hashes of the files differ. Is the difference only about the header?

Thanks for your help,

-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany

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-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany