Fig. 1.

a The experimental paradigm. The three types of task blocks (fixation, indicated by orange; sustained attention, indicated by green; switch attention, indicated by blue) were arranged in a pseudo-random order in one fMRI scan. In the baseline blocks, subjects passively gaze at the fixation cross displayed at the center of the screen. In the sustained attention blocks, subjects immediately press the button whenever a circle appears (i.e. response on the 5th and 7th slide shown in the example). b The behavioral performance of the sustained attention task. The group difference significance is shown by the p values for both the comparisons of the index of accuracy (IDA, the red bars) and the reaction time (RT, the blue bars). The error bars represent the standard error