Figure 1

The task-negative network (TNN), also known as the default mode network (DMN), with both seed-based and low-dimensional independent component analysis (ICA) (20 components) in a group analysis of 341 elderly healthy control subjects. (a) Regions with positive correlations to a 6 mm-radius spherical seed in the posterior cingulate cortex. The approximate size and location are indicated with yellow circle. (b) Three independent components within the TNN as detected by ICA (red: anterior DMN; blue: posterior DMN; green: ventral DMN).