Figure 1. Sequence of events in a sample trial.

The stimuli are not drawn to scale. In this illustrated experimental trial the cue is presented 45° away from the target, although, as described in the text, cues could appear 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, or 165° (degree of arc) from the target, either in the left or the right visual field. The CTOA was set to 200 ms, 400 ms and 1200 ms for three separate groups of participants.