Proton MR spectroscopy data is acquired using the point resolved spectroscopy localization (PRESS) method. Graphically, 3D cubic volume elements "voxels" are positioned in the anatomic locations based upon the 3D images. Voxel 1 is placed in the anterior cingulate, voxel 2 the left dorsalateral prefrontal cortex, voxel 3 within the basal ganglia encompassing the caudate, putamen and internal capsule and voxel 4 is placed along the superior temporal gyrus. Voxel 5 is used as a control and is positioned in the left centrum semiovale, a believed to be unaffected white matter region. Voxels 6 and 7 are positioned within the cerebellum and vermis, respectively.