Figure 1.

A: Two subsequent trials, once for a target (1–3), once a distractor letter (4–7). A1: Representative depiction of the presented screen before starting a trial. A2: After first gazing into the outer activation box that was randomly presented either to the left or right of the central box, participants had to make a saccade to the center to start a trial. A highlight fed back whether gaze position was registered inside the respective box. The word presented above indicated which letter was correct, which was always the leftmost letter given in gray (here: R). A3: After 3 s of keeping the gaze inside the central box and handling a potential GoNoGo signal correctly (after tone prompt in 50% of trials: press left key for distractors and right key for targets), a highlight fed back that the trial had been finished. A5–A7: Next trial, in this case with a distractor letter that has been handled correctly. B: Flowchart of trials.