(Color online) Example training scenarios used in the experiment: (left) “Beginner up-down confusions” and (right) “Novice cone of confusion”. Each colored patch corresponds to a zone; zones of identical colors correspond to a set. Yellow dots illustrate a generated set of visual targets for a trial using the black set. A scenario specific flag could be set to force symmetric target sets, e.g. along the horizontal plane as illustrated for up–down confusions training (left).