Poster A30, Saturday, March 24, 1:30–3:30 pm, Exhibit Hall C
Dynamic Reconfiguration of Inhibition Control Network in Different Bilingual Contexts
Jianqiao Ye1, Jing Yang1, Ruiming Wang2, Ke Zhou3, Yan Jing Wu3; 1Bilingual Cognition and Development Lab, Center for Linguistics and Applied Linguistics, Guangdong University of Foreign Studies, Guangzhou, 510420, China, 2Guangdong Provincial Key Laboratory of Mental Health and Cognitive Science, Center for Studies of Psychological Application, School of Psychology, South China Normal University, Guangzhou 510631, China, 3College of Psychology and Sociology, Shenzhen University, Shenzhen 518060, China
It is well documented that bilinguals activate non-target language when they process the target language. This parallel activation of two languages in bilinguals requires constant language control, which shares an overlapping brain network with domain-general inhibitory control function. As a result of long-term experience of language learning and language control, bilinguals showed better performance in non-linguistic inhibitory control tasks. Recently, some studies suggest that bilinguals' inhibitory control ability can be modulated by language context in a short timescale. The present study explored the dynamic influences of language contexts on the neural mechanism of inhibition control in trilinguals. Thirty Cantonese-Mandarin-English trilinguals, who were native speakers of Cantonese (L1) and Mandarin (L2) and learners of English (L3) with moderate proficiency, participated in this study. Participants performed picture naming tasks in mixed language blocks, which resulted in three different dual language contexts: the L1-L2, L2-L3, and L1-L3 contexts. Following each context, the participants performed the same flanker task. Our results showed classic flanker effects in the conditions of L2-L3 and L1-L3 contexts, while less interference effect in L1-L2 context. Whole brain analysis of fMRI data during flanker tasks displayed more activations in right prefrontal cortex and subcortical areas in L2-L3 and L1-L3 conditions, compared to L1-L2 context. Group connectivity patterns underlying flanker tasks in the three dual-language contexts converged on common involvement of a cortico-thalamic-striato circuit and bilateral cerebellum for inhibition control task. However, their functional brain networks reorganized dynamically following different dual-language contexts, which suggests neural plasticity in a rather short time.
Topic Area: EXECUTIVE PROCESSES: Monitoring & inhibitory control