In this condition, the target was a black filled circle of 0.7° diameter, which appeared at 4° to the left or right of the screen center. The two possible locations of the target were highlighted at all times throughout the trial with faint circular markers, 0.7° in diameter, to reduce the need for participants to maintain location-based representations of the target in WM. Upon extinction of the central cross after 200 ms, one of two stimuli appeared in the same central location: either a red cross or a green arrow, matched in size (approximately 0.7° diameter), and approximate pixel density. A 200 ms gap then elapsed, followed by the appearance of the stimulus to either the left or right as displayed in Figure 1 (right panel).