Dear Freesurfer experts,

I'm trying to investigate lh-to-rh asymmetry, so I register my subjects to the subject of fsaverage_sym following the instructions on this page: http://surfer.nmr.mgh.harvard.edu/fswiki/Xhemi. After all the surfreg commands I've got ?h.thickness files in subjid/xhemi/surf.

In my lab we generally process ?h.thickness files with the next two commands before statistically analysis:

"mris_thickness -max 10 subjid ?h thickness_max10"

"recon-all -qcache -measure thickness_max10 -target fsaverage_510 -fwhm 10 -no-isrunning -s subjid -hemi ?h"

To keep with this protocol, my questions are

1) how do I use "mris_thickness" properly so that I don't overwrite the files registered to fsaverage_510?

2) in "recon-all -qcache", will it do the trick by substituting "fsaverage_sym" for "fsaverage_510"?

Thank you in advance,

Cherry