When you say in the corpus callosum, do you mean in WM? The
surface-based analysis is only for cortical GM. If you mean in GM near
the CC, then the analysis is appropriate. The projfrac parameter sets
the sampling location between the white and pial surfaces where 0.5
means half way.
On 1/10/17 8:07 AM, John Anderson wrote:
Dear FS experts,
I am working on surface based analysis using freesurfer. I want to
inquire about the flag "projfrac" in the command "mris_preproc"
I ran voxel wise analysis including the same subjects. I found
differnce between the groups in areas close to the corpus callosum. I
want to get the same results using surface based analysis. If I use
the projfrac=0.5 is this able to show the same results that I got in
voxel wise analysis at the level of the corpus callosum. Do I need to
use differnt number for projfrac ?
Thank you for any advice.
Best,
John
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