Mini-block structure in Experiment 3.

Upper panel: both groups’ lWM2R condition involving 2 novel task-rules; middle panel: novel-rules-load group hWM6R condition involving 6 novel task-rules; lower panel: familiar-rules-load group lWM6R condition involving 2 novel task-rules + 4 familiar task-rules. Notice that in the 6 task-rules conditions, the additional rules which required simultaneous responses with both hands appeared twice on the instruction screen to demonstrate that both hands are required.