Hi Jon,
The limit numbers correspond to voxel intensities in the brainmask.mgz. I believe you will want a lower number for the -wlo/-wm_low flag to make the wm surf extend further out, assuming that the wm voxels that are not being captured by the surface is hypo-intense (<< 110).
-Louis

On Thu, 31 Oct 2013, Jonathan Holt wrote:

HI experts,

I’m wondering how these limits work, and whether the limit numbers indicate 
voxel intensity. If I wanted WM to be segmented more aggressively would I plug 
in a higher number or a lower number?

Jon
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