在口语理解过程中,小脑对单词的词汇特性非常敏感

IF 3.6 Q1 LINGUISTICS Neurobiology of Language Pub Date : 2023-11-08 DOI:10.1162/nol_a_00126
Hannah Mechtenberg, Christopher C. Heffner, Emily B. Myers, Sara Guediche
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引用次数: 0

摘要

在过去的几十年里,对小脑功能的研究已经远远超出了运动领域。越来越多的研究正在探索特定的小脑亚区,如第一和第二脚,在包括接受性语言处理在内的高阶认知功能中的作用。在当前的fMRI研究中,我们展示了在被动连续收听播客期间,小脑对词汇的两种心理语言学特性(词汇频率和语音邻域密度)变化的敏感性。为了确定小脑的活动是否以及如何与这些词汇特性相关,我们使用调幅回归器分别对每个单词进行建模,并将时间锁定在每个单词的开始时间上。在群体水平上,词汇特性的显著影响落在预期的小脑亚区:第一区和第二区。BOLD信号与两种词汇性质的变化相关;与特定语言和领域通用机制一致的模式。个体水平上的激活模式也表明,语音邻域和词汇频率的影响最可能发生在第一和第二小叶上,尽管在其他小叶上也看到了激活(尤其是频率)。虽然在言语和语言处理过程中使用的确切小脑机制尚不清楚,但这些发现强调了小脑在连续聆听过程中单词级处理中的作用。
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The cerebellum is sensitive to the lexical properties of words during spoken language comprehension
Abstract Over the past few decades, research into the function of the cerebellum has expanded far beyond the motor domain. A growing number of studies are probing the role of specific cerebellar subregions, such as Crus I and Crus II, in higher-order cognitive functions including receptive language processing. In the current fMRI study, we show evidence for the cerebellum’s sensitivity to variation in two well-studied psycholinguistic properties of words–lexical frequency and phonological neighborhood density–during passive, continuous listening of a podcast. To determine whether, and how, activity in the cerebellum correlates with these lexical properties, we modeled each word separately using an amplitude-modulated regressor, time-locked to the onset of each word. At the group level, significant effects of both lexical properties landed in expected cerebellar subregions: Crus I and Crus II. The BOLD signal correlated with variation in both lexical properties; patterns consistent with both language-specific and domain-general mechanisms. Activation patterns at the individual level also showed that effects of phonological neighborhood and lexical frequency landed in Crus I and Crus II as the most probable sites, though there was activation seen in other lobules (especially for frequency). Although the exact cerebellar mechanisms used during speech and language processing are not yet evident, these findings highlight the cerebellum’s role in word-level processing during continuous listening.
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来源期刊
Neurobiology of Language
Neurobiology of Language Social Sciences-Linguistics and Language
CiteScore
5.90
自引率
6.20%
发文量
32
审稿时长
17 weeks
期刊最新文献
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