Hi Douglas,

Well, I usually use aparcstats2table with -m thickness, but what I get is the thickness for all those 34 hemisphere regions, but not that measure of mean thickness for the hemisphere. Could I be missing something?

thanks
Daniel

Message: 15
Date: Tue, 30 Oct 2012 11:17:56 -0400
From: Douglas N Greve <greve@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] average measure of cortical thickness
To: freesurfer@nmr.mgh.harvard.edu
Message-ID: <508FEFA4.9070105@nmr.mgh.harvard.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

You can get thickness with aparcastats2table with the -m thickness
option. This gives you a measure of mean thickness for the hemisphere as
well.
do8ug


2012/10/30 Daniel Ferreira <danifer@ull.es>
Please, is there any automatic way to extract this "Mean Thickness" values for lh and rh for a big group of subjects? As for example aparcstats2table?

thank you very much

Daniel


2012/10/30 Bruce Fischl <fischl@nmr.mgh.harvard.edu>
yes, I think so

Bruce
On Tue, 30 Oct 2012, Daniel Ferreira wrote:

So, as a measure of whole brain cortical thickness average is it better to
"Mean Thickness" from aparc.stats file?


2012/10/30 Bruce Fischl <fischl@nmr.mgh.harvard.edu>
      Hi Daniel

      the parcellations are not uniform in size, and therefore the
      average of them will not be the same as averaging over the
      cortex.

      cheers
      Bruce
      On Tue, 30 Oct 2012, Daniel Ferreira wrote:

            Hi,
            I was wondering what should I use as an average of
            cortical thickness for
            the whole cortex. 

            The aparc.stats output gives a value of "Mean
            Thickness" for each
            hemisphere. But this value does not coincide with
            the one I get if I average
            the 34 variables from aparc.stats. Do you know why?

            thanks so much in advance

            Daniel




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