Hi Lijie, we have a default surface template that we use. When you create an average subject from a group, a template based on those subjects is created at the same time. This can be used as a registration target.
doug

On 3/31/11 9:03 PM, soft.join Huang wrote:

Thanks for your reply, Douglas.

I also have something unclear, that which target is used when we register one subject's surface to a 'template', a default surface in the FreeSurfer or something else, like one surface selected randomly from my specified subjects.

 

Best Regards,

Lijie Huang

On Fri, Apr 1, 2011 at 5:34 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:

Hi Lijie, yes, for the volume averages that is the process (uses the linear 12 DOF registration to the MNI305). For surfaces, the average surfaces are created based on the non-linear surface transformation (not from the average volume).
doug

soft.join Huang wrote:

Hi all:
 Recently, I have a question about some details of the function make_average_subject, which creates some average surfaces and volumes based on the specified subjects' files.
And I'm wondering how it make an average one.
In my opinion, every specified subject's volume and surface register to a existed template( something like fsaverage) and we can acquire a transform matrix or something like it. According to the transformation, we can register them roughly. And then we can average them to a mean one.
I don't know whether my thought right or not. Can anyone give me some tips? :)
 Thanks in advance
 Lijie Huang

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