Auditory cortical tuning to statistical regularities in phonology
Auditory cortical tuning to statistical regularities in phonology
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DOI：
10.1016/j.clinph.2005.08.012
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发表时间：
2005-12-01
影响因子：
4.7
通讯作者：
Blomert, L
中科院分区：
文献类型：
--
作者：
Bonte, ML;Mitterer, H;Blomert, L
目的：充足的行为证据表明语言环境的分布特性影响语音处理。然而，这些特征如何反映在神经过程中仍然很大程度上未知。目前的 ERP 研究调查了音位概率的神经生理学相关性：音素组合的分布频率。方法：我们采用了 ERP 测量来指示经验依赖性听觉记忆痕迹，即失配负性（MMN）。我们在改进的被动奇怪设计中提出了根据音位概率程度不同的非单词对，该设计最大限度地减少了声学过程的贡献。结果：在实验 I 中，与具有低音位概率的非单词 (notkel) 相比，具有高音位概率 (notsel) 的非单词引发了显着增强的 MMN。在实验 2 中，这一发现被用声学差异较小的非单词对 (notsel-notfel) 复制了。在使用具有可比语音趋向概率 (so-fo) 的刺激的第三次声学控制实验中，未观察到 MMN 增强。结论：我们的数据表明，听觉皮层对音素簇的反应是通过音素组合的统计规律来调节的。意义：这项研究表明，语言环境与塑造语音的神经处理有关。此外，它为研究具有异常语言功能（如阅读障碍）的儿童的内隐语音处理提供了一种潜在有用的设计。 (c) 2005 年国际临床神经生理学联合会。由爱思唯尔爱尔兰有限公司出版。保留所有权利。
Objective: Ample behavioral evidence suggests that distributional properties of the language environment influence the processing of speech. Yet, how these characteristics are reflected in neural processes remains largely unknown. The present ERP study investigates neurophysiological correlates of phonotactic probability: the distributional frequency of phoneme combinations.Methods: We employed an ERP measure indicative of experience-dependent auditory memory traces, the mismatch negativity (MMN). We presented pairs of non-words that differed by the degree of phonotactic probability in a modified passive oddball design that minimizes the contribution of acoustic processes.Results: In Experiment I the non-word with high phonotactic probability (notsel) elicited a significantly enhanced MMN as compared to the non-word with low phonotactic probability (notkel). In Experiment 2 this finding was replicated with a non-word pair with a smaller acoustic difference (notsel-notfel). An MMN enhancement was not observed in a third acoustic control experiment with stimuli having comparable phonotactic probability (so-fo).Conclusions: Our data suggest that auditory cortical responses to phoneme clusters are modulated by statistical regularities of phoneme combinations.Significance: This study indicates that the language environment is relevant in shaping the neural processing of speech. Furthermore, it provides a potentially useful design for investigating implicit phonological processing in children with anomalous language functions like dyslexia. (c) 2005 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.