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首页> 外文期刊>Brain and language >Multi- and unisensory decoding of words and nonwords result in differential brain responses in dyslexic and nondyslexic adults.
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Multi- and unisensory decoding of words and nonwords result in differential brain responses in dyslexic and nondyslexic adults.

机译：单词和非单词的多和单感觉解码会导致阅读障碍和非阅读障碍成年人的大脑反应不同。

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The present functional magnetic resonance imaging (fMRI) study was designed, in order to investigate the neural substrates involved in the audiovisual processing of disyllabic German words and pseudowords. Twelve dyslexic and 13 nondyslexic adults performed a lexical decision task while stimuli were presented unimodally (either aurally or visually) or bimodally (audiovisually simultaneously). The behavioral data collected during the experiment evidenced more accurate processing for bimodally than for unimodally presented stimuli irrespective of group. Words were processed faster than pseudowords. Notably, no group differences have been found for either accuracy or for reaction times. With respect to brain responses, nondyslexic compared to dyslexic adults elicited stronger hemodynamic responses in the leftward supramarginal gyrus (SMG), as well as in the right hemispheric superior temporal sulcus (STS). Furthermore, dyslexic compared to nondyslexic adults showed reduced responses to only aurally presented signals and enhanced hemodynamic responses to audiovisual, as well as visual stimulation in the right anterior insula. Our behavioral results evidence that the two groups easily identified the two-syllabic proper nouns that we provided them with. Our fMRI results indicate that dyslexics show less neuronal involvement of heteromodal and extrasylvian regions, namely, the STS, SMG, and insula when decoding phonological information. We posit that dyslexic adults evidence deficient functioning of word processing, which could possibly be attributed to deficits in phoneme to grapheme mapping. This problem may be caused by impaired audiovisual processing in multimodal areas.
机译：设计本功能磁共振成像（fMRI）研究，以研究涉及双音节德语单词和伪单词的视听处理的神经基质。 12个阅读障碍的成年人和13个非阅读障碍的成年人执行了词汇决策任务，而刺激则以单模态（听觉或视觉）或双模态（同时视听）呈现。实验期间收集的行为数据证明，与单峰刺激无关，双峰处理比单峰刺激更准确。单词比伪单词的处理速度更快。值得注意的是，在准确性或反应时间上均未发现基团差异。关于脑反应，与诵读困难的成年人相比，非诵读困难的人在左上上颌回（SMG）以及右半球颞颞沟（STS）引起更强的血液动力学反应。此外，与非诵读困难的成年人相比，诵读困难的成年人表现出对仅听觉呈现的信号的反应减少，对视听以及右前岛的视觉刺激的血流动力学反应增强。我们的行为结果证明，这两个小组很容易识别出我们提供给他们的两个音节的专有名词。我们的功能磁共振成像结果表明，阅读语音信息时，阅读障碍症患者异质模式和西斯维维亚语区域（即STS，SMG和绝缘体）的神经元参与较少。我们认为，诵读困难的成年人证明文字处理功能不足，这可能归因于音素到字素映射的缺陷。此问题可能是由于多模式区域中视听处理的受损所致。

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