“…Several studies have reported that memory of vertically explored environments is poorer than that of horizontally explored environments (Hölscher, Meilinger, Vrachliotis, Brösamle, & Knauff, 2006;Jeffery, Jovalekic, Verriotis, & Hayman, 2013;Pasqualotto & Proulx, 2013;Thibault, Pasqualotto, Vidal, Droulez, & Berthoz, 2013). It is possible that a weaker spatial representation indicated, for example, by a poorer memory within the vertical dimension, results in poorer spatially-organised representation of numbers along the respective dimension.…”