Figure 1. The experiment included a short-term memory (STM) task compared with a control no short-term memory (NSTM) task. First row from the top presents the sequence of events for the STM condition. Second row presents the sequence of events for the NSTM condition. In the Short-Term Memory (STM) task the events are as as follows: (1) a cross at the center of the monitor as baseline lasting 1 s; (2) a cross surrounded by a red circle at the center of the monitor as a visual warning stimulus lasting 1 s; (3) a couple of vertical bars as a visual cue stimulus lasting 2 s; (4) a blank screen as a delay period lasting 3.5–5.5 s; (5) a green circle at the center of the monitor as a go stimulus lasting 1 s; and (6) a finger movement as a motor response. Subjects had to click the left mouse button if the taller bar was at the left monitor side, or the right mouse button if the taller bar was at the right monitor side. Compared with the STM task, the NSTM task had visual cue stimuli lasting up to the go stimulus. The zero time was the onset of the cue stimulus.