Hi Knut:

Gryification and Surface Area are two completely different things. Surface Area, as measured by FreeSurfer, gives you the area of the surface (roughly length x breadth) of a given region of interest: e.g., Pars triangularis. It is measured in millimeter squared.

Gyrfication index, by contrast, measures the depth of the each gyri and is done after you have completed the FreeSurfer Recons. You can find more details on gyrification at the following website:

https://surfer.nmr.mgh.harvard.edu/fswiki/LGI

This explains the whole concept of gyrification.

best,

Alan

On Sun, Oct 5, 2014 at 11:51 AM, Knut J Bjuland <knutjorgen@outlook.com> wrote:

Dear FreeSurfer experts
I have run analyses on gyrification index. I was wondering if anybody could tell me what exactly is the relationship between gyrification index and cortical area. My gyrification results and area results are to a large extent similar. Am I measuring approximately the same thing?

Thank you
Knut Jørgen Bjuland
PhD candidate
The Norwegian University of Science and Technology (NTNU)
Trondheim, Norway

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