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.