Word-specific repetition effects revealed by MEG and the implications for lexical access.

Word-specific repetition effects revealed by MEG and the implications for lexical access.
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DOI:
10.1016/j.bandl.2013.09.013
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发表时间:
2013-12
期刊:
影响因子:
2.5
通讯作者:
Poeppel, David
Poeppel, David
中科院分区:
心理学3区
文献类型:
--
作者:
Almeida, Diogo;Poeppel, David

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这项脑磁图(MEG)研究调查了阅读中词汇获取的早期阶段,目的是确定词汇信息的初始接触发生在什么时候。我们确定了两个可以反映这一加工阶段的候选诱发反应:枕颞N170/M170和额中央P2。在重复启动范式中,使用长时间可变滞后来降低每次重复的可预见性,我们发现(i)单词重复而非假词在150-250 ms窗口内诱发了不同的双侧额叶反应,(ii)在单词和假词之间观察到不同的重复N400m效应。我们认为,这种额叶反应,与ERP研究中发现的P2脑相关联,反映了长期记忆表征的早期访问,我们暂时将其定性为模态特异性。
This magnetoencephalography (MEG) study investigated the early stages of lexical access in reading, with the goal of establishing when initial contact with lexical information takes place. We identified two candidate evoked responses that could reflect this processing stage: the occipitotemporal N170/M170 and the frontocentral P2. Using a repetition priming paradigm in which long and variable lags were used to reduce the predictability of each repetition, we found that (i) repetition of words, but not pseudowords, evoked a differential bilateral frontal response in the 150-250 ms window, (ii) a differential repetition N400m effect was observed between words and pseudowords. We argue that this frontal response, an MEG correlate of the P2 identified in ERP studies, reflects early access to long-term memory representations, which we tentatively characterize as being modality-specific.
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