Multiple dimensions of syntactic structure are resolved earliest in posterior temporal cortex

IF 6.7 2区 医学 Q1 NEUROSCIENCES Progress in Neurobiology Pub Date : 2024-10-01 DOI:10.1016/j.pneurobio.2024.102669
Elliot Murphy , Patrick S. Rollo , Katrien Segaert , Peter Hagoort , Nitin Tandon
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Abstract

How we combine minimal linguistic units into larger structures remains an unresolved topic in neuroscience. Language processing involves the abstract construction of ‘vertical’ and ‘horizontal’ information simultaneously (e.g., phrase structure, morphological agreement), but previous paradigms have been constrained in isolating only one type of composition and have utilized poor spatiotemporal resolution. Using intracranial recordings, we report multiple experiments designed to separate phrase structure from morphosyntactic agreement. Epilepsy patients (n = 10) were presented with auditory two-word phrases grouped into pseudoword-verb (‘trab run’) and pronoun-verb either with or without Person agreement (‘they run’ vs. ‘they runs’). Phrase composition and Person violations both resulted in significant increases in broadband high gamma activity approximately 300 ms after verb onset in posterior middle temporal gyrus (pMTG) and posterior superior temporal sulcus (pSTS), followed by inferior frontal cortex (IFC) at 500 ms. While sites sensitive to only morphosyntactic violations were distributed, those sensitive to both composition types were generally confined to pSTS/pMTG and IFC. These results indicate that posterior temporal cortex shows the earliest sensitivity for hierarchical linguistic structure across multiple dimensions, providing neural resources for distinct windows of composition. This region is comprised of sparsely interwoven heterogeneous constituents that afford cortical search spaces for dissociable syntactic relations.
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句法结构的多个维度最早在后颞叶皮层得到解析。
我们如何将最小的语言单位组合成更大的结构,这仍然是神经科学中一个悬而未决的课题。语言处理涉及同时对 "纵向 "和 "横向 "信息(如短语结构、形态一致)进行抽象构建,但以往的研究范式受限于只能分离出一种构成类型,而且时空分辨率较低。利用颅内记录,我们报告了旨在分离短语结构和形态句法一致的多项实验。我们向癫痫患者(n = 10)展示了听觉双字短语,这些短语分为假词-动词('trab run')和代词-动词(有或没有人称一致)('they run' vs. 'they runs')两类。短语构成和人称违反都会导致动词开始后大约 300 毫秒,颞叶后中回(pMTG)和颞叶后上沟(pSTS)的宽带高伽马活动显著增加,其次是 500 毫秒时的额叶下皮层(IFC)。虽然只对形态句法违规敏感的位点是分布式的,但对两种成分类型都敏感的位点一般局限于 pSTS/pMTG 和 IFC。这些结果表明,后颞皮层最早显示出对多维层次语言结构的敏感性,为不同的成分窗口提供了神经资源。该区域由稀疏交织的异质成分组成,为可分离的句法关系提供了皮层搜索空间。
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来源期刊
Progress in Neurobiology
Progress in Neurobiology 医学-神经科学
CiteScore
12.80
自引率
1.50%
发文量
107
审稿时长
33 days
期刊介绍: Progress in Neurobiology is an international journal that publishes groundbreaking original research, comprehensive review articles and opinion pieces written by leading researchers. The journal welcomes contributions from the broad field of neuroscience that apply neurophysiological, biochemical, pharmacological, molecular biological, anatomical, computational and behavioral analyses to problems of molecular, cellular, developmental, systems, and clinical neuroscience.
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