Dear all,

After studying the freesurferstats2table script for a while, I think I figure out what these surfaces are. Below is my understanding. Please correct me if I am mistaken!

In the aparc_area_lh.txt, the surface area should be one based on the pial surface, not the white surface, because we are talking about cortical area.

In the aparc_meancurv_lh.txt, the mean curvature should be one based on the Gaussian Curvature of the white surface, not the pial surface, because it is how curvature is computed in freesurfer.

Thanks!

Daniel

Daniel Yang, PhD

Postdoctoral Researcher

Child Study Center

Yale University

203-737-5454

From: <Yang>, Daniel Yang <yung-jui.yang@yale.edu>
Date: Thursday, July 19, 2012 11:51 PM
To: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Subject: questions about SurfArea and meancurv

Dear Freesurfer,

I am new to freesurfer and have a number of beginner's questions. After recon all the subjects and running the freesurferstats2table script, I am looking at the two files: aparc_area_lh.txt and aparc_meancurv_lh.txt. Everything goes by default.

My questions are,

1. In the aparc_area_lh.txt, is the surface area based on the pial surface, the white surface, or both?

2. In the aparc_meancurv_lh.txt, is it based on the Gaussian Curvature of the white surface or the pial surface?

I cannot find the relevant documentation in the freesurfer wiki. Any comments are highly appreciated!

Best Regards,

Daniel

Daniel Yang, PhD

Postdoctoral Researcher

Child Study Center

Yale University

203-737-5454