Magne Cyrille, Astésano Corine, Aramaki Mitsuko, Ystad Sølvi, Kronland-Martinet Richard, Besson Mireille
Institut de Neurosciences Cognitives de la Méditerranée, Centre National de la Recherche Scientifique and Marseille Universités, Marseille, France.
Cereb Cortex. 2007 Nov;17(11):2659-68. doi: 10.1093/cercor/bhl174. Epub 2007 Jan 30.
The present work investigates the relationship between semantic and prosodic (metric) processing in spoken language under 2 attentional conditions (semantic and metric tasks) by analyzing both behavioral and event-related potential (ERP) data. Participants listened to short sentences ending in semantically and/or metrically congruous or incongruous trisyllabic words. In the metric task, ERP data showed that metrically incongruous words elicited both larger early negative and late positive components than metrically congruous words, thereby demonstrating the online processing of the metric structure of words. Moreover, in the semantic task, metrically incongruous words also elicited an early negative component with similar latency and scalp distribution as the classical N400 component. This finding highlights the automaticity of metrical structure processing. Moreover, it demonstrates that violations of a word's metric structure may hinder lexical access and word comprehension. This interpretation is supported by the behavioral data showing that participants made more errors for semantically congruous but metrically incongruous words when they were attending to the semantic aspects of the sentence. Finally, the finding of larger N400 components to semantically incongruous than congruous words, in both the semantic and metric tasks, suggests that the N400 component reflects automatic aspects of semantic processing.
本研究通过分析行为数据和事件相关电位（ERP）数据，探讨了在两种注意力条件（语义任务和韵律任务）下，口语中语义和韵律（韵律结构）加工之间的关系。参与者听以语义和/或韵律上一致或不一致的三音节词结尾的短句。在韵律任务中，ERP数据显示，韵律不一致的词比韵律一致的词引发了更大的早期负成分和晚期正成分，从而证明了对词的韵律结构的在线加工。此外，在语义任务中，韵律不一致的词也引发了一个早期负成分，其潜伏期和头皮分布与经典的N400成分相似。这一发现突出了韵律结构加工的自动性。此外，它表明违反词的韵律结构可能会阻碍词汇通达和词义理解。行为数据支持了这一解释，即当参与者关注句子的语义方面时，他们，对于语义一致但韵律不一致的词会犯更多错误。最后，在语义任务和韵律任务中，与语义一致的词相比，语义不一致的词引发更大的N400成分，这一发现表明N400成分反映了语义加工的自动方面。
