Visual aids for gaze strategies. (A) In the center–target switching condition, participants were told to look at the center or at one of the targets. If they looked at a target, they were told to look back at the center before looking at another one. (B) In the target-looking condition, participants were told to always look at one of the targets but not at the center. Participants were not told to look at the targets in a certain sequence, to look at any specific targets, or for any specific amount of time.