It usually means that it is part of the medial wall where there is no cortex. For technical reasons we need to have the surface be a closed surface (like a sphere). That means that there have to be places that don't have cortex but we still need to represent. In these places thickness is set to 0. doug On 01/24/2013 02:21 PM, jm wrote:

Dears Freesurfer:

We are looking into *lh.thickness.fwhm15.fsaverage**.mgh* file and we can see some vertexes with thickness value equal to 0 (thickness=0 mm). Could you tell me when that value is reported by Freesurfer? what do (thickness=0) means?

Thanks in advance !!!

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