Headstart for speech segmentation: a neural signature for the anchor word effect
Headstart for speech segmentation: a neural signature for the anchor word effect
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DOI：
10.1016/j.neuropsychologia.2016.01.011
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发表时间：
2016-02-01
期刊：
影响因子：
2.6
通讯作者：
Rodriguez-Fornells, Antoni
中科院分区：
文献类型：
--
作者：
Cunillera, Toni;Laine, Matti;Rodriguez-Fornells, Antoni
学习一门新语言是一个基于先前获得的信息的渐进过程。为了阐明这一增量过程的机制，我们研究了所谓的锚定词效应的在线神经生理学相关性，其中新学习的词有助于从连续语音中分割新词。对于嵌入新学习的锚字的语音流，观察到更高的分割性能。锚词引发了增强的刺激前置消极性（SPN）成分，被认为是对传入相关信息的期望指数。此外，我们证实了之前报道的待分割新词的 N400 振幅增加，表明新词的新记忆表示出现的自下而上的学习过程。我们提出，由 SPN 索引的锚定词效果反映了对锚定词偏移处输入的新词的期望，从而促进了分割过程。 (C) 2016 Elsevier Ltd. 保留所有权利。
Learning a new language is an incremental process that builds upon previously acquired information. To shed light on the mechanisms of this incremental process, we studied the on-line neurophysiological correlates of the so-called anchor word effect where newly learned words facilitate segmentation of novel words from continuous speech. Higher segmentation performance was observed for speech streams embedded with newly learned anchor words. The anchor words elicited an enhanced Stimulus-preceding negativity (SPN) component considered to be an index of expectation for incoming relevant information. Moreover, we confirmed a previously reported N400 amplitude increase for the to-be-segmented novel words, indicating a bottom-up learning process whereby new memory representations for the novel words emerge. We propose that the anchor word effect indexed by SPN reflects an expectation for an incoming novel word at the offset of the anchor word, thus facilitating the segmentation process. (C) 2016 Elsevier Ltd. All rights reserved.