Hi John,

It depends on how you sample from the volume to the surface, but yes, in general voxels in the white matter (and deep gray matter and csf and bone, etc….) won’t show up on the surface

Cheers

Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of John Gelburg
Sent: Friday, May 7, 2021 4:45 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] How white matter voxel is represented on the surface ?

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Dear list,

I am sorry for a newbie question:

Suppose I analyze the fMRI data in a volumetric way using SPM. I have a voxel that appears in a white matter. Does this mean that this voxel will not appear on the surface? In other words, there would be no corresponding vertex for my voxel ?

I would also appreciate any reading suggestions.

Thank you,

John