Input Text: "The volume of the brain evaluated in this study. The color scale represents the number of 4-mm voxels with data in at least 7 subjects along a 3-cm deep line into the brain. A three-dimensional rendering of a brain is shown in regions where insufficient data were obtained. The most superior regions of the frontal and parietal lobes and the most inferior regions of the temporal lobes were not evaluated. Imaging artifacts may also compromise the significance of results in the most inferior portions of the frontal lobe."