Poster B61, Sunday, March 26, 8:00 – 10:00 am, Pacific Concourse
Neural correlates of word frequency effects in bilinguals
Myriam Oliver1, Manuel Carreiras1,2, Pedro M. Paz-Alonso1; 1BCBL. Basque Center on Cogntion, Brain and Language, 2IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.
Neuropsychological and neuroimaging research have extensively demonstrated the involvement of left-lateralized perisylvian regions in reading processes. While word-frequency effects have been widely investigate in monolingual adult readers, we do not much about word-frequency effects in bilinguals, whose might show variations relative to monliguals in the recruitment of the reading regions and networks typically showed to be involve in word-frequency effects. In the present fMRI study, we sought to investigate differences in the regional engagement and functional dynamics among regions along the reading network in bilinguals and monolinguals as a function of word frequency (high-frequency versus low-frequency) and reading demands (semantic versus. perceptual tasks). A total of 56 right-handed bilingual and monolingual young adults with Spanish as their L1 participated. Region-of-interest (ROI) analyses revealed that the superior temporal gyrus (STG) was more strongly engaged for monolingual than bilingual participants across low- and high-frequency word reading. Moreover, regions whithin the inferior frontal gyrus (IFG) were more strongly engaged for low-frequency than high-frequency word reading across bilingual and monolingual individuals. Also, our data revealed a stronger recruitment of the ventral-occipitotemporal (vOT) region as a function of reading demands, being more engaged for the semantic versus the perceptual reading task across stimuli and participants. Functional connectivity analyses revealed group differences in coactivation between left IFG and STG, and also between left IFG and vOT as a function of reading demands. Our data provide evidence of functional changes between the left-perisylvian reading network as a function of being bilingual or monolingual for word frequency effects.
Topic Area: LANGUAGE: Other