Have you tried using mri_label2vol with the aparc as the input instead 
of the aseg?
doug

On 04/14/2012 12:06 PM, Bruce Fischl wrote:
> mris_calc should do what you want (although the aseg is not zero in 
> the cortex, so you will change the cortical labels)
>
> cheers
> Bruce
> On Sat, 14 Apr 2012, Adil Javed wrote:
>
>> Hi,
>> Is there a way to subtract segmented files in freesurfer?  For example,
>> aparc+aseg.mgz - aseg.mgz= aparc.mgz only?  I am interested in 
>> looking only
>> at the cortex.  I find that label to volume conversion doesn't give me a
>> nice segmented cortex, with some patchy areas of intensities lost.
>>
>> thanks,
>> AJ
>>
>>
>
>
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-- 
Douglas N. Greve, Ph.D.
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