Syntax drives default language selection in bilingual connected speech production.
Jessie Quinn, Matthew Goldrick, Catherine Arnett, Victor S. Ferreira, Tamar H. Gollan · Journal of Experimental Psychology Learning Memory and Cognition · 2024
). Intrusion rates did not vary across experiments even though switch rate was doubled in Experiment 1b relative to Experiment 1a. Bilinguals produced the most intrusions in normal paragraphs, slightly but significantly fewer intrusions in noun-swapped paragraphs, and a dramatic drop in intrusion rates in the random condition, even though the random condition elicited the most within-language errors. Bilinguals also demonstrated a common signature of inhibitory control in the form of reversed language dominance effects, which did not vary significantly across paragraph types. Finally, intrusions increased with switch word predictability (surprisal), but significant differences between conditions remained when controlling for predictability. These results demonstrate that bilingual language selection is driven by syntactic processing, which operates independently from other language control mechanisms, such as inhibition. (PsycInfo Database Record (c) 2025 APA, all rights reserved).