Just run the next step, ie, mris_preproc but leave off the 
--paired-diff. Then run
mri_concat preproc.out.mgh --mean preproc.out.mean.mgh

doug
On 05/14/2013 04:12 PM, Subhabrata Chaudhury wrote:
> Hi,
> I want to create an average thickness map of lh and rh. I have run 
> surfreg steps to map lh to lh sym and rh to rh sym.
> Can you advise what to do next to mke average thickness maps between 
> two hemispheres ?
> Will either mris_calc or mri_average work to make the average map ?
> Thank you
> Subha
>
>
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Douglas N. Greve, Ph.D.
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