Separating phonological and semantic processing in auditory sentence processing: a high-resolution event-related brain potential study
Separating phonological and semantic processing in auditory sentence processing: a high-resolution event-related brain potential study
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DOI：
10.1002/hbm.20008
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发表时间：
2004-05-01
影响因子：
4.8
通讯作者：
Houlihan, ME
中科院分区：
文献类型：
--
作者：
D'Arcy, RCN;Connolly, JF;Houlihan, ME
利用高分辨率事件相关脑电位（ERPs）研究了句子匹配任务中语音和语义加工过程，以研究语音错配负性（PMN）和N400反应的空间分布。假设这两个成分在空间上是可分离的，并且活动匹配先前的定位知识。参与者检查了在语义层次内相关的视觉-听觉句子对(例如，视觉：“这个男人在教室里教书”；听觉：“这个男人在……学校/谷仓”)。口语句子最后几个词的语义一致性各不相同。不一致词在初始语音特征（意外的声音）和语义特征（意外的意义）上都与期望不匹配。此外，最终单词的类别-范例概率或高或低，低概率单词更难预测。低概率词被预测有选择性地影响PMN的活动。我们发现，对于高概率词和低概率词，不一致词都引发了一个PMN （287 msec）和一个N400 （424 msec）。正如预期的那样，低概率的一致词引发了一个小的PMN，但没有N400。相比之下，高概率全等词既没有引起可检测的PMN，也没有引起N400。原发性PMN源位于左侧额下叶和顶叶下叶。N400源的主要激活发生在左左皮层，与先前的N400源定位工作一致。这些结果表明，PMN和N400位于不同的皮层语言（和记忆）区域，并且具有不同的源激活模式。(C) 2004 Wiley-Liss, Inc。
Phonological and semantic processing was studied using high-resolution event-related brain potentials (ERPs) during a sentence-matching task to investigate the spatial distribution of the phonological mismatch negativity (PMN) and the N400 response. It was hypothesized that the two components were spatially separable and that the activity matched prior localization knowledge. Participants examined visual-auditory sentence pairs that related within a semantic hierarchy (e.g., visual: "The man is teaching in the classroom"; Auditory: "The man is in the... school/barn"). Semantic congruency was varied for the final words of the spoken sentences. Incongruent words mismatched expectation in terms of both the initial phonological features (unexpected sound) and semantic features (unexpected meaning). In addition, the category-exemplar probability of the final words was either high or low, with low probability words being more difficult to anticipate. Low probability words were predicted to selectively affect PMN activity. We found that incongruent words elicited a PMN (287 msec) and a N400 (424 msec), for both the high and low probability words. As expected, low probability congruent words elicited a small PMN but no N400. In contrast, high probability congruent words elicited neither a detectible PMN nor a N400. The primary PMN sources were in left inferior frontal and inferior parietal lobes. The primary N400 source activation occurred along the left perisylvian cortex, consistent with prior N400 source localization work. From these results, it was concluded that the PMN and N400 were localized to separate cortical language (and memory) regions and had different source activation patterns. (C) 2004 Wiley-Liss, Inc.