“…The literature assumes the existence of an evolutionary ancient system, the so-called Approximate Number System (ANS), with which humans and animals are enriched in order to estimate stimuli in nature (see Brannon, Jordan, & Jones, 2010;Feigenson et al, 2004;Piazza, 2010). Preschool children, before having acquired formal school instruction, have been consistently demonstrated to be able to successfully compare and add approximately large quantities of nonsymbolic stimuli (Barth, et al, 2006;Gilmore, et al, 2010;Libertus,et al, 2011;Mazzocco, Feigenson, & Halberda, 2011;Xenidou-Dervou, et al, in press). They can do so even when these quantities are presented in different modalities and formats (Barth, Beckmann, & Spelke, 2008;McNeil, Wagner Fuhs, Keultjes, & Gibson, 2011).…”