I'm not sure I understand what you mean. If you follow the group 
analysis wiki, it does not give you an option to even create an average 
subject, and you have to generate the average subject from 
make_average_subject. The proper path depends on what you want to do 
exactly.

If you want to do a full analysis on an average subject, then you'll 
need to create the average subject with make_average_subject. Then you 
will need to register your individuals to this subject with surfreg --s 
individual --t averagesubject ... Then run mris_preproc with --target 
averagesubject --surfreg averagesubject.sphere.reg

If you want to simply display the results on the average group anatomy, 
then run make_average_subject to create the average. Run mris_preproc 
using fsaverage. When you go to display the final result (eg, with 
tksurfer or freeview), specify the averagesubject instead of fsaverage

doug

On 04/16/2014 11:03 AM, Jonathan Holt wrote:
> Hi all,
>
> I’m currently trying to generate an average subject for two groups so that I 
> might be able to display average thickness for both groups. I’m confused as 
> to whether I should be following the GroupAnalysis workflow in the wiki, or 
> if I should use make_average_subject and mris_preproc in tandem, but for the 
> latter option (if it is the appropriate one) how should I use the two 
> together, if that’s the right approach?
>
> jon
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>

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

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