Hi Gabriele
there are non-cortical regions in the surfaces to make them closed, and these should have thicknesses that are identically zero in the interior and probably very small right at the edge. We generate a label named ?h.cortex.label for each subject that represents the valid cortical parts of the surface
cheers Bruce On Fri, 10 Feb 2012, Gabriele Corbetta wrote:
Dear all, I'm not familiar with Freesurfer and I have a very naive question... I'm reading with Matlab the .thickness files of a few subjects and I see that there are some nearly zero / zero values.. how do I interpret them? Maybe they correspond to regions which are not considered as cortex? Had I to compute the mean cortical thickness of the whole brain, would I have to discard them?
Thanks in advance. Gabriele