“…Bilingual children have repeatedly been found to score below their monolingual peers (e.g., Ben-Zeev, 1977; Bialystok, Luk, Peets, & Yang, 2010; Hemsley, Holm, & Dodd, 2006; Leseman, 2000) or below monolingual norms (e.g., Fernandez, Pearson, Umbel, Oller, & Molinetmolina, 1992; Mancilla-Martinez et al, 2011; Teoh et al, 2012; Uccelli & Paez, 2007; Uchikoshi, 2006; Umbel, Pearson, Fernandez, & Oller, 1992) on single-language vocabulary measures in one or both of their languages. Oller and colleagues (2007) highlight the distributed nature of lexical knowledge in bilinguals as a key contributor to their lower single-language vocabulary scores when compared to monolinguals.…”