Fig 1.

Schematic diagram of a trial of the slow (left) and fast (right) sequential memory tasks. In both tasks, seven arrows were presented sequentially as memory items. The inter-stimulus intervals between the presentation onset of each arrow in the slow and fast conditions were 0.6 s and 0.25 s, respectively. Upon presentation of a recall number cue, each participant answered the arrow direction corresponding to the recall number by pressing a button on a keypad. The color gradient indicates that both encoding and maintenance processing were concurrent during the memory item presentation period. BL: Baseline.