Hi Shane,

Okay, I had to dig through the code a bit to be
reminded of some details, but here is the gist of it.

In order for a surface to be used (with the 'enhanced'
terminology), it must be considered anatomically
correct. A surface can be deemed AC :) in two ways.
The sure way is for the spec file to explicitly state
that it is AC. This is done by adding the following
line to the surface's definition in the spec file:

Anatomical = Y

The other way is for the surface name to be "standard",
in which case functions guess that the surface is AC.

For most surfaces, a standard name is one that contains
".white", ".smoothwm", ".pial", ".orig", or ".fiducial".

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Sorry that this is unclear. I will add a hint for it
under the (debug > 0) cases for programs 3dSurf2Vol,
3dVol2Surf and SurfMeasures.

- rick