“…In these studies, the knower-lever theory has been widely used to assess and classify children on the basis of their cardinal knowledge development before examining other numerical skills (see also Carey et al, 2017;Cheung et al, 2016;Le Corre, 2014;Wagner & Johnson, 2011). Performance in the GaN was found to be subject to a large variability depending on different factors: the grammatical mark of the singular/dual/plural distinction in language (Almoammer et al, 2013;Sarnecka et al, 2007), the socioeconomic status (Sarnecka, Negen, & Goldman, 2018;Scheuer et al, 2019) or the cultures (children from US, Japan and Russia, Sarnecka et al, 2007; or from the Tsimane, an indigenous farming-foraging group in Bolivia, Piantadosi et al, 2014).…”