Fig 2. Activation maps for the subtraction of the alteration-detecting versus familiarity tasks. Areas of significant activation (P < .01) are superimposed onto the surface maps of the averaged MR imaging of the brains of 10 subjects. Precunei, superior and inferior parietal lobules, anterolateral portion of frontal lobes, premotor areas, middle portion of cingulated gyrus, and the cerebellum were bilaterally activated. ll, lateral surface of left hemisphere; lm, medial surface of left hemisphere; rl, lateral surface of right hemisphere; rm, medial surface of right hemisphere; up, upper surface. The left side of the bottom-image shows the left side of the brain.