This toolbox is currently only work in progress, and is an extension of the default unified
segmentation. The algorithm is essentially the same as that described in the Unified
Segmentation paper (Ashburner and Friston, 2005), except for:

• A different treatment of the mixing proportions,
• The use of an improved registration model,
• The ability to use multi-spectral data,
• An extended set of tissue probability maps, which allows a different treatment of
• voxels outside the brain,
• A more robust initial affine registration.

Some of the options in the toolbox may not yet work, and it has not yet been seamlessly
integrated into the rest of the SPM software. Also, the extended tissue probability maps
may need further refinement. The current versions were crudely generated (by JA) using
data that was kindly provided by Cynthia Jongen of the Imaging Sciences Institute at
Utrecht, NL.

J. Ashburner and K.J. Friston. Unified segmentation. NeuroImage, 26:839-851, 2005.
 
These descriptions of the new features are taken from the SPM8 Release Notes
 
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