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Across-session consistency of context-driven language processing: A magnetoencephalography study.
European Journal of Neroscience ( IF 3.4 ) Pub Date : 2020-05-20 , DOI: 10.1111/ejn.14785
Natascha Marie Roos 1 , Vitória Piai 1, 2
Affiliation  

Changes in brain organization following damage are commonly observed, but they remain poorly understood. These changes are often studied with imaging techniques that overlook the temporal granularity at which language processes occur. By contrast, electrophysiological measures provide excellent temporal resolution. To test the suitability of magnetoencephalography (MEG) to track language‐related neuroplasticity, the present study aimed at establishing the spectro‐temporo‐spatial across‐session consistency of context‐driven picture naming in healthy individuals, using MEG in two test–retest sessions. Spectro‐temporo‐spatial test–retest consistency in a healthy population is a prerequisite for studying neuronal changes in clinical populations over time. For this purpose, 15 healthy speakers were tested with MEG while performing a context‐driven picture‐naming task at two time points. Participants read a sentence missing the final word and named a picture completing the sentence. Sentences were constrained or unconstrained toward the picture, such that participants could either retrieve the picture name through sentence context (constrained sentences), or could only name it after the picture appeared (unconstrained sentences). The context effect (constrained versus unconstrained) in picture‐naming times had a strong effect size and high across‐session consistency. The context MEG results revealed alpha–beta power decreases (10–20 Hz) in the left temporal and inferior parietal lobule that were consistent across both sessions. As robust spectro‐temporo‐spatial findings in a healthy population are required for working toward longitudinal patient studies, we conclude that using context‐driven language production and MEG is a suitable way to examine language‐related neuroplasticity after brain damage.

中文翻译:

跨会话一致性的上下文驱动的语言处理:一项脑磁图研究。

通常观察到损伤后大脑组织的变化,但对它们的了解仍然很少。这些变化通常是通过成像技术来研究的,这些技术忽略了语言过程发生的时间粒度。相比之下,电生理措施可提供出色的时间分辨率。为了测试脑磁图(MEG)跟踪语言相关的神经可塑性的适用性,本研究旨在建立健康个体中上下文驱动图片命名的光谱时空跨会话一致性,在两次测试-重新测试中使用MEG 。在健康人群中进行光谱-时间-空间测试-重新测试的一致性是研究临床人群随时间推移神经元变化的先决条件。以此目的,在两个时间点执行上下文驱动的图片命名任务时,对15位健康的说话者进行了MEG测试。参与者阅读了缺少最后一个单词的句子,并命名了一张完整的句子图片。句子是针对图片的约束或不受约束的对象,因此参与者可以通过句子上下文(约束的句子)检索图片名称,也可以仅在图片出现后对其命名(不受约束的句子)。图片命名时间中的上下文效应(受约束与不受约束)具有强大的效应大小和跨会话一致性。上下文MEG结果显示,左侧颞叶和顶叶下叶的α–β功率降低(10–20 Hz),这在两个疗程中均一致。
更新日期:2020-05-20
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