Bastian,

I have not tested the freesurfer gifti output in matlab. What command are you using in matlab to open the file? Are you able to open your lh.white.gii file in another program that supports gifti? (in freesurfer, to test file validity, you can load it with: freeview -f lh.white.gii) also, another option is to use the matlab command �read_surf.m�, found in your freesurfer/matlab directory, to load the lh.white file in matlab.

Nick