[Freesurfer] Finding equivalent vertices on fsaverage_sym lh and rh surfaces

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Dear FreeSurfer experts,

for the 'fsaverage_sym' template that comes with FreeSurfer, I would like to find a mapping between equivalent vertices (i.e., vertices in the same anatomical position) between the left and right hemispheres.

By "equivalent" I mean identical anatomical positions. I noticed, for example, that vertex 500 in the file fsaverage_sym/surf/lh.white and vertex 500 in the file fsaverage_sym/surf/rh.white are not at equivalent anatomical points.

I feel this mapping must be documented somewhere or there is an obvious way to get it that I am currently overlooking, so I thought I'd ask here.

Thanks in advance,

Tim

-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany