In a standard PST trial, after the task instructions had been presented on screen, the initial central fixation cross was superseded by the target stimulus (a 0.7° diameter, red filled circle) that remained on the screen for 2 s, before disappearing. A 200 ms gap then elapsed, while the screen was completely blank, before the target stimulus reappeared at a location of 4° to the left or right of the screen center, where it remained for 2 s. The 4° target eccentricity has been used in previous saccadic eye movement studies (e.g., Nieuwenhuis et al., 2004) and thus allows for comparisons with the present research. Similarly, the standard timings utilized in the gap paradigm are of 200 ms (cf. Crawford et al., 2002; Eenshuistra et al., 2004; Evdokimidis et al., 2006). After a further 700 ms, the target stimulus was extinguished, and the next trial commenced with the appearance of the two concentric circles for drift correction. After 30 consecutive trials, the instruction screen reappeared to remind participants of the requirements of the task at hand and also to allow for short recess in testing should participants so wish. The presentation order of the composite screens in the standard PST (and standard AST-s) condition is shown in Figure 1 (left panel).