Hello,

sorry for asking this again

I want to calculate the difference between the thickness of one subjects different hemispheres and show this on pial (left or right or even fsaverage_sys). so I have ran :

surfreg --s $subject --t fsaverage_sym --lh

surfreg --s $subject --t fsaverage_sym --lh --xhemi

for my one subject. now I have two .reg files:

shahi/xhemi/surf/lh.fsaverage_sym.sphere.reg

shahi/surf/lh.fsaverage_sym.sphere.reg

If I am understanding this right, these two are the transform matrix for both hemisphere of my one subject to fsaverage_sym (right?)

if I run mris_preproc with xhemi option I will get a vector which have the length equal to number of vertexes. it's values are left-right (or right-left?). how can I convert this vector to pial or inflated surface? and how can I use lh.fsaverage_sym.sphere.reg to register my pial directly to fsaverage_sym?

Regards,

Ashkan

Ashkan Faghiri
MSc student of Bioelectrical Engineering
Department of Electrical Engineering
Sharif University of Technology