The N400 and Late Positive Complex (LPC) Effects Reflect Controlled Rather than Automatic Mechanisms of Sentence Processing.
The N400 and Late Positive Complex (LPC) Effects Reflect Controlled Rather than Automatic Mechanisms of Sentence Processing.
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DOI：
10.3390/brainsci2030267
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发表时间：
2012-08-14
期刊：
影响因子：
3.3
通讯作者：
Kotchoubey B
中科院分区：
文献类型：
--
作者：
Daltrozzo J;Wioland N;Kotchoubey B
这项研究比较了言语感知过程中事件相关电位（ERP）效应的自动认知过程和受控认知过程。句子被呈现给以法语为母语的人，最终的单词可以是一致的或不一致的，并以四个降级级别之一呈现（使用粉红噪声调制）：无降级、轻度降级（2 个级别）或强烈降级。我们假设退化对受控过程的影响大于对自动过程的影响。 N400 和晚期阳性复合体 (LPC) 效应被定义为不一致词减去一致词的相应波幅之间的差异。在轻度退化下，受控句子级处理仍然可能发生（如行为数据所示），N400 和 LPC 效果均被延迟，并且后者效果减弱。在强烈退化的情况下，句子处理相当自动（如行为数据所示），ERP 效应不复存在。这些结果表明，在复杂的上下文（例如句子）中引发的 ERP 效应反映了语音处理的受控机制，而不是自动机制。这些结果与使用单词对或单词列表范例的实验结果不同。
This study compared automatic and controlled cognitive processes that underlie event-related potentials (ERPs) effects during speech perception. Sentences were presented to French native speakers, and the final word could be congruent or incongruent, and presented at one of four levels of degradation (using a modulation with pink noise): no degradation, mild degradation (2 levels), or strong degradation. We assumed that degradation impairs controlled more than automatic processes. The N400 and Late Positive Complex (LPC) effects were defined as the differences between the corresponding wave amplitudes to incongruent words minus congruent words. Under mild degradation, where controlled sentence-level processing could still occur (as indicated by behavioral data), both N400 and LPC effects were delayed and the latter effect was reduced. Under strong degradation, where sentence processing was rather automatic (as indicated by behavioral data), no ERP effect remained. These results suggest that ERP effects elicited in complex contexts, such as sentences, reflect controlled rather than automatic mechanisms of speech processing. These results differ from the results of experiments that used word-pair or word-list paradigms.