Re: [Freesurfer] Where does a sulcus end and a gyrus begin in FreeSurfer?

Hi Daniel

we have had various neuroanatomists make that decision, but the typical measure used is the average convexity or sulc (stored in ?h.sulc). Where it crosses 0 is where the changeover is usually deemed to be

cheers Bruce

On Mon, 22 Apr 2013, Yang, Daniel wrote:

Dear FreeSurfer Experts and Users,

This is probably a basic question, so please bear with me.

I'm looking at the Coronal view in tkmedit, and I am wondering how does FreeSurfer knows where a gyrus ends and a sulcus begins (and vice versa).

For example, I'm looking at the superior temporal sulcus. But I'm not sure how FS figures out which part is superior temporal gyrus, middle temporal gyrus, or superior temporal sulcus?

Thanks! Daniel