Poster D44, Monday, March 27, 8:00 – 10:00 am, Pacific Concourse
The Neural Correlates of Proactive and Reactive Control in Bilingual Word Production
Junjie Wu1, Yongben Fu1, Chunyan Kang1, Shuhua Li1, Taomei Guo1; 1Beijing Normal University
Bilingual speakers can use two languages with one brain. Thus, they engage more cognitive control to select the correct intended language. The present study examined the neural activity of proactive control and reactive control during bilingual word production. Chinese-English bilinguals were instructed to name pictures in their native language or second language. Compared to naming pictures in single language blocks, bilinguals need more proactive control to predict and resolve conflicts in the mixed naming blocks. In the mixed naming context, compared to non-switch trials, bilinguals need more reactive control to inhibit the parallel activated non-target language in the switch trials. We found that naming latencies for mixed language blocks were significantly longer than those for single-language trials, and that naming latencies for switch trials were significantly longer than those for non-switch trials. The fMRI results showed that the proactive control involved bilateral middle frontal gyrus, left inferior parietal lobule, left superior parietal and right frontal operculum; whereas the reactive control engaged left supplementary motor area, right putamen, right inferior temporal gyrus, and bilateral cerebellum. This results indicate a separate brain network of proactive control and reactive control in bilingual production. Specifically, proactive control depends on the frontal-parietal network, and reactive control depends on frontal-subcortical network and cerebellum.
Topic Area: EXECUTIVE PROCESSES: Goal maintenance & switching