Dear Bruce,
One last question. I saved the cut surface as rh.inner-skull-surface (original was rh.sub_inner_skull_surface) as a patch, but when trying to see it in tksurfer, I get the following error message:
 
tksurfer sub rh inner-skull-surface
subject is sub
hemi is rh
surface is inner-skull-surface
surfer: current subjects dir: /usr/local/freesurfer/subjects
surfer: not in "scripts" dir ==> using cwd for session root
surfer: session root data dir ($session) set to:
surfer: /home/ovl
checking for nofix files in 'inner-skull-surface'
Reading image info (/usr/local/freesurfer/subjects/graff)
Reading /usr/local/freesurfer/subjects/graff/mri/orig.mgz
surfer: Reading header info from
/usr/local/freesurfer/subjects/graff/mri/orig.mgz
mrisFindNeighbors:
/usr/local/freesurfer/subjects/graff/surf/rh.inner-skull-surface:
face[0].v[0] = 0, but face 0 not in vertex 0 face list
 
What should I do so that the cut surface is interpreted as surface for import in matlab and electrode projection?
 
Octavian