The presentation order of the resulting three conditions was controlled so as to balance any potential effects resulting from asymmetric transfer of experience from one task to the next. Since a PST (where the desired response was for participants to orient their eyes towards the visual target) by definition required less deliberation than the AST (in which participants were required to avert their eyes from the visual target), a PST was always presented before the three ASTs to prevent the additional cognitive processing inherent within the AST impacting on the PST. The two standard tasks (standard PST and AST-s) each comprised 60 trials, split into three blocks of 20, with the location of the visual target (4° to the left or to the right of the central fixation cross) randomized across each block, with the constraint that no more than five consecutive runs of each target location was to be deployed, in order to prevent participants anticipating the target location, or displaying practice effects to that particular target location. The memory-guided task comprised 48 trials, organized into two blocks of 24 trials. The location of the target (1, 3, or 5° to the left or to the right of the central fixation cross) was randomized, with the constraint that no more than five consecutive runs of each target location would be deployed. The go/no-go task comprised 48 trials organized into two blocks of 24. In these conditions, both the target location (4° to the left or to the right of the central fixation cross) and the type of central cue presented (a red cross denoting a no-go trial, or a green arrow denoting a go trial) were randomized, subject to a maximum of five consecutive runs of any one target location and central cue combination. In every condition, participants were offered a brief period of respite after each block of trials, if desired, in addition to a break after each of the three experimental conditions. Performance was assessed in terms of saccade latencies (mean response times after presentation of the target stimulus), spatial accuracy (mean deviation of final eye position from the centre of the intended target location), and error rates (the proportion of trials in which participants moved their eyes in a direction contrary to the task requirements).