Hi Inge,

that looks like posterior hippocampus. We constrain the pial and white surfaces to not move in non-cortical regions so that they don't contribute to the volume/surface area of the ribbon. There's a label named ?h.cortex.label that is automatically created that gives the region of the surface that is cortex (as opposed to ventricles, caudate, hippocampus, etc...).

cheers, Bruce

On Fri, 20 Jul 2007, Inge K. Amlien wrote:

Hello list, when I process on v3.05 I notice areas where the pial and wm surfaces intersect, giving cortical thickness = 0. This is usually seen in the medial temporal area.

Is this a known issue, and how should I deal with it?

See attached screenshots.

Have a nice day Inge Amlien Department of Psychology University of Oslo

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