Hi Jing, by default it does include all the non-cortical structures in the medial wall, including any subcortical structures. If you include --cortex in the command-line it zeros them out. The way it works is that it goes through each vertex on the surface, gets the RAS coordinate for that vertex, applies the registration matrix to map it into the function space, then samples the function value using nearest neighbor (can change to trilinear with --interp trilin).

doug

On 4/26/11 1:51 PM, Jing Ming wrote:

Hi Surfers:

I am using mri_vol2surf to project fMRI result into the fsaverage surface. And the fMRI result may contain some subcortical regions, so, I wonder mri_vol2surf will automatically get rid of the subcortical region and only map cortical area into surface right? Is there any material about the mapping algorithm of mri_vol2surf? Thanks much!

Jing
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