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首页> 外文期刊>The European Journal of Neuroscience >Phonological but not auditory discrimination is impaired in dyslexia.
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Phonological but not auditory discrimination is impaired in dyslexia.

机译：语音障碍，而不是听觉障碍在阅读障碍中受损。

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摘要

Deficient phonological skills are considered to be a core problem in developmental dyslexia. Children with dyslexia often demonstrate poorer performance than non-impaired readers when categorizing speech-sounds. Using the automatic mismatch response, we show that in contrast to this deficit at the behavioural level, neurophysiological responding in dyslexic children indicates their ability to automatically discriminate syllables. Therefore, the phonological deficit is unlikely to be caused by a temporal deficit or by a noisy functional organization in the respective representational cortex. We obtained measures of reading, spelling and categorical speech-perception from 58 dyslexic children and 21 control children. The children also participated in magnetoencephalographic measurements while being stimulated acoustically with the syllables /ba/ and /da/ in an oddball paradigm. Mismatch field (MMF) amplitudes between standard and deviant stimuli were obtained. Dyslexic children performed more poorly thancontrol children on all test measures. However, the groups did not differ in MMF amplitude or latency. No correlations were found between MMF amplitudes and behavioural performance. These results were obtained with a large sample size and thus speak robustly against a general deficit in auditory discrimination in dyslexia. These results are compatible with the idea that decoding difficulties occur later in the processing stream where access to the phonological lexicon is attempted.
机译：语音功能不足被认为是发育障碍的核心问题。阅读障碍儿童在对语音进行分类时，通常表现出比未受损的阅读器差的表现。使用自动失配反应，我们显示出与行为水平上的这种缺陷相反，阅读障碍儿童的神经生理学反应表明他们能够自动区分音节。因此，语音缺陷不太可能是由各自的代表皮层中的时间缺陷或嘈杂的功能组织引起的。我们从58名阅读障碍儿童和21名对照儿童中获得了阅读，拼写和绝对语音知觉的测量指标。这些孩子还参加了脑磁图测量，同时在奇数球范式中用音节/ ba /和/ da /进行了声学刺激。获得标准和异常刺激之间的不匹配场（MMF）幅度。在所有测试指标上，阅读障碍儿童的表现均比对照儿童差。但是，各组的MMF幅度或等待时间没有差异。没有发现MMF振幅和行为表现之间的相关性。这些结果是通过大样本量获得的，因此可以说服诵读困难的听觉辨别力普遍不足。这些结果与以下想法相符：在尝试访问语音词典的处理流中，以后会出现解码困难。

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