Neural Mechanism Underlying Speech Production and Lexical Memory Representation in Bilinguals
|Keywords||Bilinguals Left inferior frontal gyrus Word Production Memory Recognition fMRI|
· In the the bilingual brain imaging study, how bilingual speech production and the vocabulary memory is the current research, bilingual speech production and vocabulary brain mechanisms of memory using functional magnetic resonance imaging (fMRI) study. Experiment 1 explored the coordinates of the location and signal strength bilingual speech production mechanism of the brain and the left inferior frontal gyrus activation. Black and white line art materials, 12 Cantonese students picture naming magnetic resonance data collection. The results showed that the Cantonese and Mandarin activation in the left inferior frontal gyrus, right middle occipital gyrus and right precuneus. Cantonese additional activation of the right frontal gyrus, the anterior lobe of the right top next time and left wedge. Mandarin additional activation the left cerebellar mouth peak, left cingulate, left middle frontal gyrus and the left edge of the back. Interested in the region in the left inferior frontal gyrus, Cantonese activate left prefrontal ventrolateral cortex (BA47) and dorsolateral cortex (BA9) Mandarin only activate the prefrontal dorsolateral cortex (BA9), Mandarin Cantonese activation volume greater than. The study indicated that bilinguals' native language (L1) and second language (L2) there is a common neural mechanisms of speech production, but also have their own specific nerve tissue in the left inferior frontal gyrus; L1, L2 has a different spatial signal characteristics. Experiment 2 by English words and Chinese characters stored in the memory and brain activation recognition operations, to explore bilingual storage and extract two types of operations of the brain processing of Chinese characters and English differences. The classic \Found that differences in brain regions Chinese character recognition less recognition in English as the right cerebellum, left inferior parietal lobule (BA40), the left middle temporal gyrus. The less English learning kanji learning and memory recognition no differences in brain areas at the 0.05 level. 8 Learning and Memory total average activation: the kanji activate left cerebellum (hill), right lingual gyrus, left parietal lobule; English activated left fusiform gyrus, right lingual gyrus, left parietal lobule, right cerebellum (hill). Recognition activation area: Chinese-English activate brain regions completely different Chinese character recognition is activated right cerebellum (section), the right frontal / back, left / right superior parietal lobule, left lentiform back, right caudate nucleus, right top on leaflets. English activate the right lingual gyrus, right cingulate gyrus, left inferior parietal lobule. The experiments show that the bilingual brain mechanisms exist differences in the different stages of the memory process, small differences in memory stage in learning Chinese characters and English recognition stage differences. Chinese character recognition than English recognition takes more brain resources. English recognition both storage activity, attention and language activities. In summary, the experiments showed that bilingual memory and vocabulary in the mother tongue and second language process, both share the same neural mechanisms, there are also each specific processing brain regions. We tend to think of the brain characterization of native language / second language to each specific neural network model, rather than targeted at some specific brain regions. The results of this study is important to the understanding of the native language and the second language storage and brain mechanisms.