Due to their experience of managing two languages, it has been suggested that bilinguals could receive more practice in the domain of working memory (WM) leading to a WM bilingual advantage. Although some studies have shown that bilinguals can outperform monolinguals in WM tasks, the studies investigating WM capacity in bilinguals provide inconsistent findings regarding the existence of a bilingual advantage. We therefore conducted a meta-analysis on the association between bilingualism and WM capacity. Data from 116 studies (involving 177 pairs of participants and 444 effect sizes) were extracted. Based on previous findings, we examined age, characteristics of the WM tasks –i.e. complexity (simple span vs transformation vs complex span tasks) and domain (verbal vs nonverbal) – age of first exposure to L2, and L2 proficiency as potential moderating variables. Results indicated a small bilingual advantage in WM (g = .12, p = .054), which was moderated by the language used in the verbal WM task. The bilingual advantage was stronger when the verbal WM task was performed in L2 compared to L1. Thus, the bilingual experience is associated with slightly higher WM capacity. Nevertheless, future studies would benefit from greater consideration of individual differences within groups of bilingual individuals.

In Italian, developing readers exhibit lexicality and frequency effects, and are sensitive to the distributional properties of the language. But how do bilingual children with different ages of first L2 (Italian) exposure and L2 vocabulary sizes read L2 words and pseudowords? Two reading aloud experiments investigated lexicality, frequency and stress assignment effects in fourth- and fifth-grade bilinguals and monolinguals. Naming latencies and pronunciation accuracy were analyzed. In Experiment 1, effects of lexicality and frequency and between-group differences emerged. In Experiment 2, the word frequency effect was confirmed. Late bilinguals, characterized by a smaller L2 vocabulary size, were less accurate than early bilinguals and monolinguals in assigning non-dominant stress. As with monolinguals, lexical information seems to be employed when reading Italian as a second language. Furthermore, bilingual readers are sensitive to the distributional properties of the language. Stress assignment is affected by the L2 lexicon size of second-language learners.