Dear Freesurfer experts, Based on the FS wiki, I calculated the cortical thickness difference between the lh and rh of a subject.Now, I want to use the “mris_apply_reg” command to map the “left-right difference” from fsaverage_sym back to the subject's native surface.Unfortunately, I did not find the appropriate options of this command to do this work.Thanks for any help. Best regards,Ali-Reza Ali-Reza Mohammadi-Nejad Pre-doctoral research fellow Radiology and Neurology Research Henry Ford Health System Detroit, MI 48202, USA