Inhibitory control processes and lexical access in trilingual speech production

This study tests whether or not trilingual language learners rely on inhibitory control (IC) when accessing words during speech production. In particular, it investigates the extent to which second language (L2) and third language (L3) lexical robustness modulates such reliance. English language learners of French and Spanish participated in a picture-naming task containing language switches in all three of their languages. Analyses were conducted on the switching performance of the three languages followed by an exploration of how these effects were modulated by L2 and L3 lexical robustness. The results support reliance on IC for all three languages. Furthermore, the strength of L2 lexical robustness affected performance in all languages whereas the strength of L3 lexical robustness only affected L3 performance. The results suggest that in the context of having to switch between three languages within a single experiment, trilingual speakers rely on IC.