Hello freesurfer experts,
I'm a newbie for freesurfer and would like to ask a naive
question.
I've just applied smoothing onto a single surface mgh file
using mri_surf2surf (with fwhm ==4) and examined the values in
the output map.
As it turns out, values become 0 in a number of vertices
after smoothing while those in many other vertices look normal
(i.e., more or less similar to the values in the vertex of
unsmoothed map).
I'm not sure why this happened as smoothing average values
locally within the kernel (4mm).
Any helpful answers would be greatly appreciated.
Glen
p.s) fyi, the original EPI is a slap data covering only the
temporal & occipital cortex.