Figure 1.

Task paradigm. A, Subjects performed two types of working memory task; one was a simple visual WM task and the other was a visual RWM task in which subjects were asked to select the correct picture with the same hand flipped over from the palm side (acquisition) to the rear (recognition). For the resting control condition (Con), subjects were asked to look at a cross mark centered in the screen. To avoid drowsiness under control conditions, subjects were instructed to press a button in the right or left hand every 18 s. B, Each condition continued for 3 min and each interval lasted for 7 min with the eyes closed (black square).