Hertrich Ingo, Kirsten Mareike, Tiemann Sonja, Beck Sigrid, Wühle Anja, Ackermann Hermann, Rolke Bettina
Center for Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Germany.
Evolutionary Cognition, Department of Psychology, University of Tübingen, Germany.
Brain Lang. 2015 Oct;149:1-12. doi: 10.1016/j.bandl.2015.06.005. Epub 2015 Jul 13.
Discourse structure enables us to generate expectations based upon linguistic material that has already been introduced. The present magnetoencephalography (MEG) study addresses auditory perception of test sentences in which discourse coherence was manipulated by using presuppositions (PSP) that either correspond or fail to correspond to items in preceding context sentences with respect to uniqueness and existence. Context violations yielded delayed auditory M50 and enhanced auditory M200 cross-correlation responses to syllable onsets within an analysis window of 1.5s following the PSP trigger words. Furthermore, discourse incoherence yielded suppression of spectral power within an expanded alpha band ranging from 6 to 16Hz. This effect showed a bimodal temporal distribution, being significant in an early time window of 0.0-0.5s following the PSP trigger and a late interval of 2.0-2.5s. These findings indicate anticipatory top-down mechanisms interacting with various aspects of bottom-up processing during speech perception.
语篇结构使我们能够根据已经引入的语言材料生成预期。目前的脑磁图（MEG）研究探讨了测试句子的听觉感知，其中通过使用预设（PSP）来操纵语篇连贯性，这些预设在唯一性和存在性方面与前文语境句子中的项目相符或不相符。在PSP触发词之后的1.5秒分析窗口内，语境违背导致听觉M50延迟以及对音节起始的听觉M200互相关反应增强。此外，语篇不连贯导致在6至16Hz的扩展α波段内频谱功率受到抑制。这种效应呈现双峰时间分布，在PSP触发后的早期时间窗口0.0 - 0.5秒和后期间隔2.0 - 2.5秒时显著。这些发现表明在言语感知过程中，自上而下的预期机制与自下而上处理的各个方面相互作用。
