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The N400 and LPC Effects Reflecting Controlled but Not Automatic Mechanisms of Sentence Processing

The N400 and LPC Effects Reflecting Controlled but Not Automatic Mechanisms of Sentence Processing
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摘要 This study focused on the automatic versus controlled nature of the underlying cognitive processes of ERPs (Event-Related Potentials) effects during speech perception. ERPs to the final word of sentences (half being semantically incongruent with the sentence and half congruent) were presented to French natives under 4 levels of degradation: no degradation, mild degradation (2 levels), and strong degradation. Under mild degradation allowing controlled sentence-level processing according to behavioral data, the N400 effect (i.e., the N400 to incongruent words minus the N400 to congruent words) and a late positive complex were delayed and the latter effect was reduced. Under strong degradation allowing only automatic sentence processing according to behavioral data, no ERP effects remained. These results suggest that, unlike contextual effect found with single words (e.g., using word-pair or word-list paradigms), ERP effects elicited by more complex contexts such as full sentences are generated by controlled but not by automatic mechanisms of speech processing.
出处 《Journal of Philosophy Study》 2011年第4期275-294,共20页 哲学研究(英文版)
关键词 ERPs (Event-Related Potentials) MASKING mask semantic PRIMING control context AUDITORY language speech 允许控制 句子 加工 机制 LPC 事件相关电位 有效保护率 认知过程
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