Fig. 4.

Hypothesis-driven analyses reveal increased activity within the default network during the passive condition. Significantly increased fMRI blood oxygenation level-dependent (BOLD) signal (an indirect measure of activity) was observed during the passive condition compared with either the broad or focal attention conditions. BOLD signal is measured as percentage signal change compared with baseline. This pattern was observed in A, a large region of interest comprising multiple regions within the default network; as well as in B, the anterior medial prefrontal cortex; and in C, the posterior cingulate cortex. The image insets (top left in each panel) show the regions plotted in either transverse (A) or sagittal (B and C) views. Error bars reflect SE. ***P < 0.001.