Figure 5.

A: Trials were performed as in Experiment 1, however, no target word was presented during Block 1, letters were therefore neither targets nor distractors. B: Flowchart of trials: at a chance of either 25% or 75% the letters X or K were presented upon fixation of the central box. In 50% of cases, a sinewave tone prompted participants to press the up key; participants needed to keep gazing into the central box for 3 s. Else, no key press was required until a highlight fed back that the trial had been handled correctly.