Fig. 2.

Self-reported attention and RT variability additively account for DMN activity. (A) 3D plot showing all trial blocks in all subjects with values for off-task rating (x₁; within-subject normalized off-task rating), RT variance (x₂), and DMN %SC (y). Color is proportional to mesh surface height, with red areas highest (high DMN activity) and blue areas lowest (low DMN activity). (B) Bar plots showing mean DMN %SC in trial blocks with four combinations of on-/off-task attention and high and low RT variance, with on/off (low/high) categories defined based on median split of all trial blocks of all subjects for within-subject normalized off-task ratings and RT variance. DMN, default mode network; RT, reaction time; SC, signal change.