TMS uncovers details about sub-regional language-specific processing networks in early bilinguals

被引:6
作者
Hamalainen, Sini [1 ,2 ]
Makela, Niko [3 ,4 ]
Sairanen, Viljami [5 ,6 ,7 ]
Lehtonen, Minna [1 ,8 ]
Kujala, Teija [1 ]
Leminen, Alina [1 ,9 ]
机构
[1] Univ Helsinki, Fac Med, Dept Psychol & Logoped, Cognit Brain Res Unit, Siltavuorenpenger 1 B, FIN-00014 Helsinki, Finland
[2] Aalto Univ Espoo, Aalto NeuroImaging, Adv Magnet Imaging Ctr, Espoo, Finland
[3] Aalto Univ, Sch Sci, Dept Neurosci & Biomed Engn, Espoo, Finland
[4] Helsinki Univ Hosp, HUS Med Imaging, BioMag Lab, Helsinki, Finland
[5] Univ Helsinki, Dept Phys, Lab Med Phys, Helsinki 00014, Finland
[6] Univ Helsinki, HUS Med Imaging Ctr, Radiol, Helsinki 00029, Finland
[7] Helsinki Univ Hosp, Helsinki 00029, Finland
[8] Abo Akad Univ, Dept Psychol, Turku, Finland
[9] Aarhus Univ, Dept Clin Med, Ctr Funct Integrat Neurosci, Aarhus, Denmark
基金
芬兰科学院;
关键词
TMS; Bilingualism; Language-specific; Picture naming; TRANSCRANIAL MAGNETIC STIMULATION; HIGHLY PROFICIENT BILINGUALS; SPEECH PRODUCTION; WORD-FREQUENCY; LEXICAL ACCESS; BROCAS AREA; INTERLOCUTOR IDENTITY; STATE-DEPENDENCY; REACTION-TIME; BRAIN;
D O I
10.1016/j.neuroimage.2017.12.086
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Despite numerous functional neuroimaging and intraoperative electrical cortical mapping studies aimed at investigating the cortical organisation of native (L1) and second (L2) language processing, the neural underpinnings of bilingualism remain elusive. We investigated whether the neural network engaged in speech production over the bilateral posterior inferior frontal gyrus (pIFG) is the same (i.e., shared) or different (i.e., language-specific) for the two languages of bilingual speakers. Navigated transcranial magnetic stimulation (TMS) was applied over the left and right posterior inferior gyrus (pIFG), while early simultaneous bilinguals performed a picture naming task with their native languages. An ex-Gaussian distribution was fitted to the naming latencies and the resulting parameters were compared between languages and across stimulation conditions. The results showed that although the naming performance in general was highly comparable between the languages, TMS produced a language-specific effect when the pulses were delivered to the left pIFG at 200 ms poststimulus. We argue that this result causally demonstrates, for the first time, that even within common language-processing areas, there are distinct language-specific neural populations for the different languages in early simultaneous bilinguals.
引用
收藏
页码:209 / 221
页数:13
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