0.2 (73.2) n.s. 307.5 (84.3) 248.8 (89.9) ns. Parieto-occipital sulcus 2836 (5418) 2962.5 (433.4) n.s. 2440.7 (472.7) 2686.6 (530.6) n.s. Pericallccal sulcus 1367.4 (185.9) 1637.4 (259.8) <.05' 1236 (220.1) 1544.4 (290.3) <.05' Planum polare 1930.8 (425.7) 2051.8 (440.6) n.s. 1812.9 (344.