Language lateralisation in late proficient bilinguals: A lexical decision fMRI study
Language lateralisation in late proficient bilinguals: A lexical decision fMRI study
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DOI：
10.1016/j.neuropsychologia.2012.01.005
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发表时间：
2012-04-01
期刊：
影响因子：
2.6
通讯作者：
Waldie, Karen E.
中科院分区：
文献类型：
--
作者：
Park, Haeme R. P.;Badzakova-Trajkov, Gjurgjica;Waldie, Karen E.
世界上大约一半的人口现在会说一种以上的语言。因此，了解双语者语言组织的神经基础，以及语言处理过程中涉及的皮质网络是否与单语者不同，是一个重要的研究领域。一个主要问题是二语(第二语言)是否使用与调节第一语言(第一语言)加工相同的神经机制进行加工。调节因素包括二语习得年龄和熟练程度。本研究采用功能性磁共振成像(FMRI)中五个条件的词汇判断任务，研究了八名晚期熟练双语者在使用马其顿语(L1)和英语(L2)时的语言加工过程。双语者在L1和L2的加工过程中都有更多的双边激活，因此，与匹配的对照英语单语者相比，语言偏侧化更弱。双语者的总体激活量也更大，尤其是在U状态下。生活在二语环境中的晚期熟练双语者在处理他们的第二语言时使用比单语者更广泛的神经网络。(C)2012爱思唯尔有限公司。保留所有权利。
Approximately half the world's population can now speak more than one language. Understanding the neural basis of language organisation in bilinguals, and whether the cortical networks involved during language processing differ from that of monolinguals, is therefore an important area of research. A main issue concerns whether L2 (second language) is processed using the same neural mechanisms that mediate L1 (first language) processing. Moderating factors include the age of L2 acquisition and the level of proficiency. Here we used a lexical decision task with five conditions during functional magnetic resonance imaging (fMRI) to investigate language processing in eight late proficient bilinguals when using Macedonian (L1) and English (L2). Bilinguals had greater bilateral activation during both L1 and L2 processing, and therefore weaker language lateralisation, compared to matched control English monolinguals. A greater amount of overall activation was also seen in bilinguals, especially during U conditions. Late proficient bilinguals living in their L2 environment employ a more extensive neural network than monolinguals when processing their second language. (C) 2012 Elsevier Ltd. All rights reserved.