yes, in some of the parcellations it corresponds to "unknown", which is not cortical (e.g. the medial wall) On Sun, 31 Jul 2011, Matt Glasser wrote:

Zero probably means ?no label.?

Peace,

Matt.

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From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of Forrest Sheng Bao Sent: Sunday, July 31, 2011 3:00 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] label value 0 in annot file

hi,

I noticed an interesting thing today. I used read_annotation function in matlab to load an .annot file, i.e., [Vertexes,Label,Colortable]=read_annotation(AnnotFile);

But some labels in Labels were 0's. They did not appear in the 5th column of Colortable.table. And 0 was the only label that i couldn't find in the 5th column of Colortable.table. All other labels were fine.

Any idea what the cause of 0's as labels might be?

Cheers, Forrest