The effect of individual differences in working memory capacity on sentence comprehension: an FMRI study.
The effect of individual differences in working memory capacity on sentence comprehension: an FMRI study.
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DOI：
10.1007/s10548-012-0264-8
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发表时间：
2013-07
期刊：
影响因子：
2.7
通讯作者：
Cheng, Hu
中科院分区：
文献类型：
--
作者：
Newman, Sharlene D.;Malaia, Evie;Seo, Roy;Cheng, Hu
本研究探讨工作记忆系统-情节和言语工作记忆-和语言处理之间的相互作用，通过检查工作记忆容量（WMC）的差异如何调制的神经激活水平和功能连接在句子理解。在探测阶段，额下回和内侧前额叶皮层的激活与WMC相关，这表明在左侧IFG中观察到的并非所有激活都是语言特异性的，而是与理解过程中招募的执行过程相关。后扣带回/楔前叶激活与句子阅读过程中的WMC分数呈负相关。此外，PCC和IFG之间的功能连接与WMC呈正相关，而PCC和下顶叶皮质之间的功能连接与WMC呈负相关。总之，这些结果表明，高容量和低容量的读者可能会利用不同的处理策略与高容量的读者利用情景记忆系统在句子阅读，以产生一个表征的事件（事件表征）。两组人在探索阶段都使用执行工作记忆过程。
This study explores the interaction between working memory systems - episodic and verbal working memory - and language processing by examining how differences in working memory capacity (WMC) modulated neural activation levels and functional connectivity during sentence comprehension. Activation of the inferior frontal gyrus and medial prefrontal cortex was correlated with WMC during the probe phase, suggesting that not all of the activation observed in the left IFG is language-specific, but is instead related to executive processes recruited during comprehension. Posterior cingulate/precuneus activation was negatively correlated with WMC scores during sentence reading. In addition, functional connectivity between the PCC and IFG was positively correlated with WMC while that between the PCC and the inferior parietal cortex was negatively correlated with WMC. Together these results suggest that high-capacity and low capacity readers may utilize different processing strategies with high capacity readers utilizing episodic memory systems during sentence reading to generate a representation of the events (event representation). Both groups use executive working memory processes during the probe phase.
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