“…Indeed, a large number of studies have shown that numerical judgments are highly influenced by the visual perceptual properties of the stimulus (e.g. density, sum of perimeter, surface area, length, size…) in children and adults (Dormal & Pesenti, 2007;Gebuis, Cohen Kadosh, de Haan, & Henik, 2009;Rousselle & Noël, 2008;Rousselle, Palmers, & Noël, 2004). Some studies even fail to find any evidence of a sensitivity to numerical differences when the perceptual variables, which naturally covary with numerosities, are strictly controlled for (Clearfield & Mix, 1999, 2001Feigenson, Carey, & Spelke, 2002;Mix, 2002;Rousselle et al, 2004).…”