Fatima, I can't really say anything on this topic but I did want to point you to some information on FreeSurfer vs. VBM: http://surfer.nmr.mgh.harvard.edu/fswiki/UserContributions/FAQ#Q.Whatarethea...
Allison
On Fri, 8 Jul 2011, Ahmed, F, Me fahmed@sun.ac.za wrote:
Hello,
I'm wondering if anyone could help me out with a question I had. For a study I'm working on, I'm comparing the regional brain volumes in adolescents with and without PTSD. I ran VBM analysis and Freesurfer on my subjects and I found some significant results on VBM (however, only using uncorrected p values) and on Freesurfer, I found no group differences in brain regions. Is there an explanation for that?
If anyone has any thoughts I'd really appreciate it. Thank you kindly!
Fatima