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Dear Doug,
The objective is to have _regional_ laterality index for thickness for aparc mapped to the left hemisphere. The following commands work without error but are they correct for meeting my objective? Thanks.
surfreg --s $subject --t fsaverage_sym --lh --no-annot
surfreg --s $subject --t fsaverage_sym --lh --no-annot --xhemi
mri_convert $subject/surf/lh.thickness $subject/surf/lh.thickness.mgh
mri_convert $subject/surf/rh.thickness $subject/surf/rh.thickness.mgh
mris_apply_reg --src $subject/surf/lh.thickness.mgh --trg $subject/surf/lh.thickness.lh.fsaverage_sym.mgh --streg $subject/surf/lh.fsaverage_sym.sphere.reg fsaverage_sym/surf/lh.sphere.reg
mris_apply_reg --src $subject/surf/rh.thickness.mgh --trg $subject/surf/rh.thickness.lh.fsaverage_sym.mgh --streg $subject/xhemi/surf/lh.fsaverage_sym.sphere.reg fsaverage_sym/surf/lh.sphere.reg
fscalc $subject/surf/lh.thickness.lh.fsaverage_sym.mgh pctdiff0 $subject/surf/rh.thickness.lh.fsaverage_sym.mgh div 200 -o $subject/surf/li.thickness.lh.fsaverage_sym.mgh
mri_segstats --annot fsaverage lh aparc --i $subject/surf/li.thickness.lh.fsaverage_sym.mgh --sum $subject/stats/li.thickness.aparc.stats
-joost