Word and pseudoword superiority effects reflected in the ERP waveform
Word and pseudoword superiority effects reflected in the ERP waveform
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DOI：
10.1016/j.brainres.2010.02.084
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发表时间：
2010-05-06
期刊：
影响因子：
2.9
通讯作者：
Mitra, Priya
中科院分区：
文献类型：
--
作者：
Coch, Donna;Mitra, Priya
Reicher-Wheeler任务的一种变体被用来确定在事件相关电位(ERP)中何时可能存在单词和假词优势效应的指数，以及优势效应的事件相关电位测量是否与拼写流利性和单个单词阅读的标准化行为测量相关。事件相关电位被记录为简单呈现的掩蔽字母串，包括真实单词(Dark/Park)、假词(DARL/PARL)、非单词(RDKA/RPKA)和字母-in-X(DXXX，PXXX)刺激。参与者决定两个字母中的哪一个出现在字符串的给定位置(这里是强制选择选项D和P)。在行为上，观察到单词(比基线非单词或字母-in-X更准确地选择单词中的字母)和伪词(比基线条件下更准确地选择伪词中的字母)优势效应。从电生理角度看，正字法规则性和熟悉性效应早在P150时窗(100-160ms)就可观察到，词汇性效应早在N200时窗(160-200ms)就可观察到，与基线刺激相比，N300和N400的波幅也能区分词和假词。此外，P150和N400事件相关电位词汇优势效应的大小与流利性和阅读的标准化行为测量有关。结果表明，在流利阅读的成年人中，正字法流利性既体现在较低水平的次词汇知觉加工上，也体现在较高水平的词汇加工上。(C)2010爱思唯尔B.V.保留所有权利。
A variant of the Reicher-Wheeler task was used to determine when in the event-related potential (ERP) waveform indices of word and pseudoword superiority effects might be present, and whether ERP measures of superiority effects correlated with standardized behavioral measures of orthographic fluency and single word reading. ERPs were recorded to briefly presented, masked letter strings that included real words (DARK/PARK), pseudowords (DARL/PARL), nonwords (RDKA/RPKA), and letter-in-xs (DXXX, PXXX) stimuli. Participants decided which of two letters occurred at a given position in the string (here, forced-choice alternatives D and P). Behaviorally, both word (more accurate choices for letters in words than in baseline nonwords or letter-in-xs) and pseudoword (more accurate choices for letters in pseudowords than in baseline conditions) superiority effects were observed. Electrophysiologically, effects of orthographic regularity and familiarity were apparent as early as the P150 time window (100-160 ms), an effect of lexicality was observed as early as the N200 time window (160-200 ms), and peak amplitude of the N300 and N400 also differentiated word and pseudoword as compared to baseline stimuli. Further, the size of the P150 and N400 ERP word superiority effects was related to standardized behavioral measures of fluency and reading. Results suggest that orthographic fluency is reflected in both lower-level, sublexical, perceptual processing and higher-level, lexical processing in fluently reading adults. (C) 2010 Elsevier B.V. All rights reserved.