While preparing a little script to cook up a derivative atlas
(Harvard-Oxford-cort with laterality information) I thought to make use
of the laterality probabilities present in the accompanying subcortical
atlas.  Unfortunately values in left hemisphere are suggestively
incorrect.  They rarely add up to ~100 % (in the right everything seems
to be sensible) even within the hemisphere, leaving an impression that
in about 10-30% of population participated in the atlasing
experiment left hemisphere was absent ;-)

Brief random example:

left:  -46, 6, 30 -- 76% cortex + 8 % WM
right:  46, 6, 30 -- 66% cortex + 31% WM

For your investigation, here is a Nifti file with probabilities
added up across different "structures" within the same hemisphere (so
should be close to a 100 in most of the "brain"):

http://www.onerussian.com/tmp/HarvardOxford-sub-laterality.nii.gz

volume 0 -- right
volume 1 -- left

thanks in advance for correcting the atlas

P.S. On a related note -- I wonder if this atlas dataset could be
open-sourced -- i.e. if original anatomicals and their labeling could
have been distributed  accompanied with associated processing scripts to
catch/fix such bugs "in the source"?

-- 
Yaroslav O. Halchenko
Postdoctoral Fellow,   Department of Psychological and Brain Sciences
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
WWW:   http://www.linkedin.com/in/yarik