On 09/26/2012 12:36 AM, Darren Gitelman wrote:
> Hi
>
> I have 3 questions:
>
> 1) Does it affect the stats (or does it just affect the display) if I 
> use the fsaverage brain vs. the average of my subjects brains when 
> running mris_preproc or when simulating the cluster statistics using 
> mri_glmfit-sim?
It will affect it some because the tessellations will be different. I 
have not done too many experiments to measure it, but the one I did do 
showed very little difference when using a subject-specific atlas. Your 
mileage may vary.  mri_glmfit-sim expects there to be tables for each atlas.
>
> 2) I downloaded the simulations for multiple comparisons correction 
> mult-comp_cor.tar.gz. (which I later realized were also in 
> freesurfer/average/mult-comp-cor). How do I apply the simulations to 
> my data (assuming I used fsaverage)? It doesn't really say on the 
> group analysis page how to apply the *.cdf file (or I missed it).
Run mri_glmfit-sim with the --cache option. Run it with --help to get 
more info.
>
> 3) I see on the list that mention is made of a possible symmetric 
> template, and there is an fsaverage-sym directory in the file I 
> downloaded. Is this template available?
>
Yes, see
http://surfer.nmr.mgh.harvard.edu/fswiki/Xhemi

doug

> Thanks,
> Darren
>
> -- 
> Darren Gitelman, MD
> Northwestern University
> 710 N. Lake Shore Dr.
> Abbott 11th Floor
> Chicago, IL 60611
> Ph: (312) 908-8614
> Fax: (312) 908-5073
>
>
>
>
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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
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Fax: 617-726-7422

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