Effects of task language and second-language proficiency on the neural correlates of phonemic fluency in native Japanese speakers: a functional near-infrared spectroscopy study
Effects of task language and second-language proficiency on the neural correlates of phonemic fluency in native Japanese speakers: a functional near-infrared spectroscopy study
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任务语言和第二语言熟练程度对日语母语者音素流利度神经相关性的影响：功能性近红外光谱研究
作者：
G. Wroblewski;K. Matsuo;Keiko S. Hirata;Toshio Matsubara;Kenichiro Harada;Yoshifumi Watanabe;K. Shinoda
音素流利度任务（或“FAS 测试”）是用于评估认知缺陷的神经心理学电池的标准组成部分，期间收集的数据可能依赖于语言，并且可能因第二语言熟练程度而异。任务语言独特的拼写/语音系统，以及双语者固有的认知优势，都可能影响任务的神经关联。然而，目前大多数测试音素流畅性的研究并未评估语言背景。在这里，我们在大学年龄的日本本土受试者中使用 52 通道功能近红外光谱仪来检查在用日语和英语进行的音素流利性任务中引起的氧合血红蛋白的功能变化。我们发现与任务语言和第二语言熟练程度相关的活动差异。除了在日语测试中激活的位点外，在英语测试中还专门招募了双侧中央前通道。此外，熟练程度较高的组在任何一种语言环境中都显示出氧合血红蛋白几乎没有增加，而熟练程度较低的参与者在两种语言环境中都显示出广泛的增加。我们将中央前增加解释为第二语言环境中额外的发音资源招募的结果。至于熟练程度较高的群体缺乏这种差异，这可能反映了该群体在非语言执行控制方面的优势。总之，我们的结果表明，语言背景和熟练程度是音素流畅性神经影像学研究中的混杂变量，并且在未来的研究中需要考虑这些措施在不同语言背景的人群中的充分性。
Data collected during a phonemic fluency task (or ‘FAS test’), a standard component of neuropsychological batteries for assessment of cognitive deficits, may be language-dependent and may differ depending on second-language proficiency. The unique orthographic/phonological system of the task language, and the reported cognitive advantages inherent to bilinguals, may each influence the task’s neural correlates. However, language background is not currently assessed in most studies testing phonemic fluency. Here, we used 52-channel functional near-infrared spectroscopy in college-aged native-Japanese subjects to examine functional changes in oxygenated hemoglobin elicited during a phonemic fluency task performed in Japanese and in English. We found activity differences that were related to task language and second-language proficiency. Besides loci activated in the Japanese test, bilateral precentral channels were specifically recruited in the English test. Furthermore, the higher-proficiency group showed almost no increase in oxygenated hemoglobin in either language context, whereas participants with lower proficiency showed widespread increases for both contexts. We interpret precentral increases as the consequence of additional articulatory resource recruitment in a second-language context. As for the lack of such variation in the higher-proficiency group, it may reflect an advantage in nonverbal executive control in this group. Together, our results point to language background and proficiency as confounding variables in neuroimaging studies of phonemic fluency and that the adequacy of such measures in populations with varying language backgrounds needs to be considered in future studies.
影响因子：
14.5
作者：
Hillis, AE;Work, M;Maurer, K
通讯作者：
Maurer, K