| Summary: | 博士 === 國立臺灣師範大學 === 資訊教育研究所 === 105 === In a digital age, bilingual learning is currently pervasive in globalization society and is inevitably facilitated by learning technology. In order to investigate the effectiveness of digital learning on learning Chinese as a second language (CSL) from the perspective of cognitive neuroscience, the present study integrated the interdisciplinary knowledge among digital learning, linguistics, and cognitive neuroscience by non-invasive neuroimaging technology measurement in addition to behavior assessment. The research evidences elaborate the learning effect as a result of the brain neural plasticity, in which was observed after the short-term and non-specific tonal perception training for CSL beginning learners. By using a MEG experiment of magnetic correspondent of mismatch negativity (MMNm) paradigm with within-subjects design, the present study investigated the learning effect of CSL beginning learner who enrolled in a short term digital learning program. In the experiment, the measurements of MMNm, with the contrast between large deviant T3/T1 and between small deviant T3/T2, were computed to index the patterns of processing lexical tone in the brain. Results of the MMNm data indicated that activation for large contrast T3/T1 elicited earlier and significantly larger amplitude than of the small deviant contrast T3/T2, which is in line with previous studies done on native Chinese speakers. More importantly, in the comparison of pre-test and post-test time course, the amplitude of MMNm showed a significant increase in the left hemisphere after learning. The evidence indicated clearly a learning effect in the perception of linguistic features and a left lateralized neural network of processing Mandarin lexical tones as native-like pattern. Moreover, in the source analysis, the left lateralized patterns of prefrontal generator (i.e., insula) and generator of auditory cortex (i.e., Heschl's Gyrus) were observed after learning, which is also consistent with the native Mandarin speaker's response patterns. In other words, the present study provides neural evidence for a functional reorganization in the brain of CSL learners after a short-term and non-specific training program. The functional reorganization, in line with the duplex perception mechanism and functional –dependent lateralization, is reflected in transforming from predisposed acoustic-dependent right dominance for non-tonal language to linguistic functional-dependent left lateralization, as a tonal language native-like pattern. In sum, the present study provides an innovative implication of brain neural plasticity to bridge the changes of behavioral performance and neural mechanism of digital learning on second language.
|
|---|
