Neurocognitive adaptations to bilingual experience
A growing body of research shows that bilingual experience, and crucially the degree of engagement with that experience, affects domain-general neurocognitive outcomes, including attentional control and task switching and their neural underpinnings (e.g., Carter et al., 2023; Kałamała et al., 2022; Pereira Soares et al., 2022; Timmer et al., 2017). I will present a recent proposal of bilingualism induced neurocognitive adaptations developed in my lab, the Unified Bilingual Experience Trajectories (UBET) framework (DeLuca et al., 2020), and data that tests its predictions. The first study shows how individual differences in bilingual experience such as intensity and diversity of bilingual language use as well as duration of bilingual language usage are related to structural brain measures associated with executive control. Two electroencephalographic studies show how individual difference measures lead to functional brain changes in cognitive control paradigms that test interference suppression (flanker and Simon task; Carter et al., 2023) and task switching (color shape and number-letter task; DeLuca et al., in prep). Taken together, the data largely support the UBET model. Interestingly, though, functional brain changes do not always lead to behavioural changes in cognitive control tasks, suggesting that bilingual experiences lead to differences in the engagement of cognitive control mechanisms without necessarily leading to a previously proposed ‘bilingual advantage’.