2021 Fiscal Year Final Research Report

Neural impact of native language literacy on the processing of non-native languages. Evidence from Chinese-English-Japanese and Vietnamese-English-Japanese trilinguals

Research Project

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Project/Area Number	18K00687
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 02090:Japanese language education-related
Research Institution	Kyoto University
Principal Investigator	Dinh Thuy 京都大学, 医学研究科, 研究員 (30602073)
Co-Investigator(Kenkyū-buntansha)	中村仁洋国立障害者リハビリテーションセンター(研究所), 研究所脳機能系障害研究部, 主任研究官 (40359633) 藤本晃司京都大学, 医学研究科, 特定准教授 (10580110) 岡田知久京都大学, 医学研究科, 准教授 (30321607)
Project Period (FY)	2018-04-01 – 2022-03-31
Keywords	bilingual / fMRI / language function
Outline of Final Research Achievements	1)Head motion during the acquisition of fMRI data can significantly contaminate the neural signal and induce spurious, distance-dependent changes in signal correlations. Recently, ICA-based denoising technique has widely been used as a powerful tool for removing spurious motion-related signal from the data. The present study used ICA as a denoising approach and showed a strong correlation between the number of total ICA components with head mean motion and FD, which indicated that the number of ICA components can be a screening index for detecting high motion-related fMRI datasets. 2)The present study showed that there were different brain activation for phonological decision in Japanese and English languages in trilingual Chinese-native speakers. Once again, our results strongly demonstrated that nature of L1 literate influences how our brain processes the different L2 languages. This in turn may indicate that the educational strategies can be used to manipulate the acquisition of L2.
Free Research Field	linguistic fMRI
Academic Significance and Societal Importance of the Research Achievements	While the native language (L1) is considered to be an inborn ability and acquired universally in the evolutionary process of human being, the nature of the second language (L2) is an acquired skill and the neural system involved in the operation of L2 may express the literacy influence of L1.