Left middle temporal deactivation caused by insufficient second language word comprehension by Chinese–Japanese bilinguals

Neuroimaging studies of second language (L2) comprehension have reported that the low L2 proficiency of non-proficient learners is associated with greater brain activation in several regions due to the increased deployment of resources to process a not-so-familiar language. However, until now, no attention has been paid to the possibility that the non-proficiency of such learners can actually lead to insufficient use of brain regions where the first language (L1) speakers show increased brain activation. Here, our fMRI study found that the left middle temporal gyrus was less active during the L2 lexical decision of non-proficient Chinese learners of Japanese as L2 than during the L1 lexical decision of native Japanese speakers. Our results indicate that the difficulty experienced by non-proficient L2 learners in L2 lexical decision is due to their less active use of the left middle temporal gyrus, which is, contrastively, used actively by L1 speakers in their L1 lexical decision. These results in turn suggest that left middle temporal activation reflects whether or not the lexical information of L2 words is formed appropriately as part of the L2 mental lexicon.

[1]  C. Fiebach,et al.  fMRI Evidence for Dual Routes to the Mental Lexicon in Visual Word Recognition , 2002, Journal of Cognitive Neuroscience.

[2]  Colin M. Brown,et al.  The Neural Circuitry Involved in the Reading of German Words and Pseudowords: A PET Study , 1999, Journal of Cognitive Neuroscience.

[3]  Stephen M. Rao,et al.  Human Brain Language Areas Identified by Functional Magnetic Resonance Imaging , 1997, The Journal of Neuroscience.

[4]  Xiaoping Hu,et al.  Differential activity in left inferior frontal gyrus for pseudowords and real words: An event‐related fMRI study on auditory lexical decision , 2005, Human brain mapping.

[5]  Shigeru Sato,et al.  Cortical Mechanisms Involved in the Processing of Verbs: An fMRI Study , 2006, Journal of Cognitive Neuroscience.

[6]  Robert J. Zatorre,et al.  Bilingual brain organization: A functional magnetic resonance adaptation study , 2006, NeuroImage.

[7]  L. Tan,et al.  Functional anatomy of syntactic and semantic processing in language comprehension , 2002, Human brain mapping.

[8]  Gui Xue,et al.  An fMRI study with semantic access in low proficiency second language learners , 2004, Neuroreport.

[9]  D. Caplan,et al.  Processing of Visually Presented Sentences in Mandarin and English Studied with fMRI , 1999, Neuron.

[10]  K. Amunts,et al.  The role of the left Brodmann's areas 44 and 45 in reading words and pseudowords. , 2005, Brain research. Cognitive brain research.

[11]  P. Indefrey A Meta‐analysis of Hemodynamic Studies on First and Second Language Processing: Which Suggested Differences Can We Trust and What Do They Mean? , 2006 .

[12]  Shigeru Sato,et al.  Cross-linguistic influence on brain activation during second language processing: An fMRI study , 2007, Bilingualism: Language and Cognition.

[13]  Shigeru Sato,et al.  Cortical activation in the processing of passive sentences in L1 and L2: An fMRI study , 2006, NeuroImage.

[14]  Jubin Abutalebi,et al.  The neural basis of first and second language processing , 2005, Current Opinion in Neurobiology.

[15]  Marcel Adam Just,et al.  An fMRI Study of Bilingual Sentence Comprehension and Workload , 2002, NeuroImage.

[16]  R. C. Oldfield The assessment and analysis of handedness: the Edinburgh inventory. , 1971, Neuropsychologia.

[17]  C. Büchel,et al.  Broca's area and the language instinct , 2003, Nature Neuroscience.

[18]  D Klein,et al.  Cerebral organization in bilinguals: a PET study of Chinese-English verb generation. , 1999, Neuroreport.

[19]  Eraldo Paulesu,et al.  The role of age of acquisition and language usage in early, high‐proficient bilinguals: An fMRI study during verbal fluency , 2003, Human brain mapping.

[20]  C. Fiebach,et al.  Processing lexical semantic and syntactic information in first and second language: fMRI evidence from German and Russian , 2005, Human brain mapping.

[21]  Soyoung Suh,et al.  Effects of syntactic complexity in L1 and L2; An fMRI study of Korean–English bilinguals , 2007, Brain Research.

[22]  C. Price,et al.  A functional imaging study of translation and language switching. , 1999, Brain : a journal of neurology.

[23]  Alan C. Evans,et al.  The neural substrates underlying word generation: a bilingual functional-imaging study. , 1995, Proceedings of the National Academy of Sciences of the United States of America.

[24]  Ping Li,et al.  Neural representations of nouns and verbs in Chinese: an fMRI study , 2004, NeuroImage.

[25]  J. Xiong,et al.  Neural systems of second language reading are shaped by native language , 2003 .

[26]  Joel R. Meyer,et al.  Modality independence of word comprehension , 2002, Human brain mapping.

[27]  J. Fadili,et al.  The neural representation of nouns and verbs: PET studies. , 2001, Brain : a journal of neurology.

[28]  Isabell Wartenburger,et al.  Early Setting of Grammatical Processing in the Bilingual Brain , 2003, Neuron.

[29]  Michael J. Spivey,et al.  Shared and separate systems in bilingual language processing: Converging evidence from eyetracking and brain imaging , 2003, Brain and Language.

[30]  E. T. Possing,et al.  Neural Correlates of Lexical Access during Visual Word Recognition , 2003, Journal of Cognitive Neuroscience.

[31]  Viorica Marian,et al.  Cortical activation during word processing in late bilinguals: Similarities and differences as revealed by functional magnetic resonance imaging , 2007, Journal of clinical and experimental neuropsychology.

[32]  D. Perani,et al.  The neural correlates of verb and noun processing. A PET study. , 1999, Brain : a journal of neurology.

[33]  M. Chee,et al.  Relative Language Proficiency Modulates BOLD Signal Change when Bilinguals Perform Semantic Judgments , 2001, NeuroImage.

[34]  V Bettinardi,et al.  The bilingual brain. Proficiency and age of acquisition of the second language. , 1998, Brain : a journal of neurology.