Neurobiology of Language Department, Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands.
Department of Speech and Language Therapy, Istanbul Medipol University, Istanbul, Turkey.
Brain Behav. 2023 Jul;13(7):e3046. doi: 10.1002/brb3.3046. Epub 2023 May 3.
INTRODUCTION: Despite abundant research on the role of Broca's area in language processing, there is still no consensus on language specificity of this region and its connectivity network. METHODS: The present study employed the meta-analytic connectivity modeling procedure to identify and compare domain-specific (language-specific) and domain-general (shared between language and other domains) functional connectivity patterns of three subdivisions within the broadly defined Broca's area: pars opercularis (IFGop), pars triangularis (IFGtri), and pars orbitalis (IFGorb) of the left inferior frontal gyrus. RESULTS: The findings revealed a left-lateralized frontotemporal network for all regions of interest underlying domain-specific linguistic functions. The domain-general network, however, spanned frontoparietal regions that overlap with the multiple-demand network and subcortical regions spanning the thalamus and the basal ganglia. CONCLUSIONS: The findings suggest that language specificity of Broca's area emerges within a left-lateralized frontotemporal network, and that domain-general resources are garnered from frontoparietal and subcortical networks when required by task demands.
简介:尽管有大量研究探讨了布洛卡区在语言处理中的作用,但该区域的语言特异性及其连接网络仍未达成共识。 方法:本研究采用元分析连接建模程序,以确定和比较三个广泛定义的布洛卡区内部的三个细分区域(左侧下额回的额下回的三角部(IFGtri)和眶部(IFGorb))的特定领域(语言特定)和非特定领域(语言和其他领域共享)的功能连接模式。 结果:研究结果揭示了所有与特定领域语言功能相关的感兴趣区域的左侧额颞网络。然而,非特定领域的网络则跨越了额顶区域,与多需求网络重叠,并跨越丘脑和基底神经节的皮质下区域。 结论:研究结果表明,布洛卡区的语言特异性出现在左侧额颞网络内,而当任务需求需要时,非特定领域的资源则来自额顶和皮质下网络。
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