The AST-s condition was visually identical to the PST condition, with the exception of the instructions given to participants. The initial instruction screen requested that participants look to a point in space that they considered being the horizontal mirror-image location of the target stimulus. Further verbal clarification was given to ensure that participants knew that they were required to look to a point equally distant from the center, but in the opposite direction to, the target stimulus. The presentation order of the composite screens in the AST-s condition (and standard PST condition) is represented in Figure 1 (left panel).