Several other functional neuroimaging studies have provided additional support for estrogen dependent alterations in frontal lobe functioning. For instance, menopausal women treated for 21 days with conjugated equine estrogens were shown to have increased activation in the superior frontal lobe during a verbal working memory task as assessed with fMRI [262]. Similarly, Berman et al. [261] demonstrated that suppression of estrogen levels with Lupron, a GnRH agonist, led to a loss of the previously observed regional cerebral blood flow (rCBF) increase in prefrontal cortex in young women during the Wisconsin Card Sorting Test. Normalization of the activation pattern in the prefrontal cortex was noted when estrogenwas added to Lupron regimen. Augmentation of temporal and parietal cortex was also observed, which fits with the current hypothesis that memory consolidation can occur throughout the cortex [277]. In a recent study, Erickson et al. [278] used high resolution magnetic resonance imaging and an optimized voxel-based morphometric technique to examine the effects of HRT on brain volume in postmenopausal women.