Power spectra (n=12) of mean blood oxygen level-dependent (BOLD) signals at (A) right isthmus of cingulate cortex (R ICC), (B) left isthmus of cingulate cortex (L ICC), (C) right lateral occipital cortex (R LOC), (D) left lateral occipital cortex (L LOC), (E) right hippocampus, and (F) left hippocampus. Solid line: mean. Dotted lines: standard error. AU, arbitrary unit.