“…Some studies show an inverted-U shape development with the peak of scale errors occurring at 20-24 months and their disappearance by 30 months (DeLoache et al, 2004;Ware et al, 2010), while others showed a linear decrease from infancy to 40 months (Brownell et al, 2007;Grzyb et al, 2018;Rosengren, Carmichael, et al, 2009). Some studies show an inverted-U shape development with the peak of scale errors occurring at 20-24 months and their disappearance by 30 months (DeLoache et al, 2004;Ware et al, 2010), while others showed a linear decrease from infancy to 40 months (Brownell et al, 2007;Grzyb et al, 2018;Rosengren, Carmichael, et al, 2009).…”