Dear Freesurfer-Experts,

I am trying to flip surface files (.mgh) from right to left.

I have read your instructions concerning xhemi and performed registration to fsaverage_sym:

foreach subject (subjectlist) surfreg --s $subject --t fsaverage_sym --lh surfreg --s $subject --t fsaverage_sym --lh --xhemi end

I would now like to flip surfaces containing fMRI-values (initally on the right hemisphere) to the left hemisphere for statistics in a common space.

How do I achieve this?

I have tried using mri_surf2surf with different side (--srchemi rh --trghemi lh) using the fsaverage_sym as subject.

However would I not need a registration file rh.lh.sphere.reg for that? It doesn't work with using the left side as targed either (results are shifted and do not match the location on the original hemisphere)

What am I doing wrong?

I dont want to compare the right with the left hemisphere (I simply want to have all affected surfaces on one side of the brain).

any help would be appreciated!

Bastian