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http://dx.doi.org/10.9718/JBER.2008.29.4.272

Neural Switching Mechanism in the late Korean-English bilinguals by Event-Related fMRI  

Kim, Jeong-Seok (Department of Research & Development, GE Ultrasound Korea)
Publication Information
Journal of Biomedical Engineering Research / v.29, no.4, 2008 , pp. 272-277 More about this Journal
Abstract
Functional MRI technique was used in this study for examining the language switching mechanisms between the first language (L1) and the second language (L2). Language switching mechanism is regarded as a complex task that involves an interaction between L1 and L2. The aim of study is to find out the brain activation patterns during the phonological process of reading real English words and English words written in Korean characters in a bilingual person. Korean-English bilingual subjects were examined while they covertly read four types of words native Korean words, Korean words of a foreign origin, English words written in Korean characters, and English words. The fMRI results reveal that the left hemispheric language-related regions at the brain, such as the left inferior frontal, superior temporal, and parietal cortices, have a greater response to the presentation of English words written in Korean characters than for the other types of words, in addition, a slight difference was observed in the occipital-temporal lobe. These results suggest that a change in the brain circuitry underlying the relational processes of language switching is mainly associated with general executive processing system in the left prefrontal cortex rather than with a similarity-based processing system in the occipital-temporal lobes.
Keywords
Langauge Switching; Korean words; Left prefrontal cortex; Event-related fMRI;
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