Sketch of the experimental setup.

<p>A visual cue, specifically an arrow pointing upwards or downwards, was presented after subjects released a start button (delay between releasing and presentation on the screen: 30 ms). The upward arrow indicated that subjects should continue to the target button, the downward arrow indicated that subjects should abort the movement. The visual cue, determining the response, was presented with different display durations, ranging from 20 ms to 300 ms. Two masks, presented immediately (delay below 1 ms) after the visual cue, degraded the perceptibility of the visual cue. The display duration for the target cue in this sketch was 20 ms. Note that, for all other display durations, the presentation of the masks was delayed (e.g. with a display duration of 40 ms for the target cue, the second mask appeared after 70 ms with respect to the release of the start button). Only in the <i>Verbalization protocol</i>, a tone was presented with a delay of 1 second after providing the target cue. Subjects had to verbalize what they saw before this tone.