Figure 1.
Default mode activity in young adults measured by [15O]H2O PET. Transverse (horizontal) sections through the brain show activity during default states in young adults from a meta-analysis of nine studies (data from Shulman et al., 1997b). The left hemisphere is displayed on the left. Section labels (at bottom) correspond to the approximate transverse level from the Talairach and Tournoux (1988) atlas. Scale is in percentage of PET counts. Notable default mode activity is apparent in medial and lateral posterior parietal regions, extending into precuneus, posterior cingulate, and retrosplenial cortex, as well as in frontal cortex along the midline.