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首页> 外文期刊>The European Journal of Neuroscience >Task-irrelevant visual letters interact with the processing of speech sounds in heteromodal and unimodal cortex.
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Task-irrelevant visual letters interact with the processing of speech sounds in heteromodal and unimodal cortex.

机译：与任务无关的视觉字母与异模式和单模式皮质中的语音处理相互作用。

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摘要

Letters and speech sounds are the basic units of correspondence between spoken and written language. Associating auditory information of speech sounds with visual information of letters is critical for learning to read; however, the neural mechanisms underlying this association remain poorly understood. The present functional magnetic resonance imaging study investigates the automaticity and behavioral relevance of integrating letters and speech sounds. Within a unimodal auditory identification task, speech sounds were presented in isolation (unimodally) or bimodally in congruent and incongruent combinations with visual letters. Furthermore, the quality of the visual letters was manipulated parametrically. Our analyses revealed that the presentation of congruent visual letters led to a behavioral improvement in identifying speech sounds, which was paralleled by a similar modulation of cortical responses in the left superior temporal sulcus. Under low visual noise, cortical responses in superior temporal and occipito-temporal cortex were further modulated by the congruency between auditory and visual stimuli. These cross-modal modulations of performance and cortical responses during an unimodal auditory task (speech identification) indicate the existence of a strong and automatic functional coupling between processing of letters (orthography) and speech (phonology) in the literate adult brain.
机译：字母和语音是口头和书面语言之间对应的基本单位。将语音的听觉信息与字母的视觉信息相关联对于学习阅读至关重要。然而，这种关联的神经机制仍然知之甚少。当前的功能磁共振成像研究研究了整合字母和语音的自动性和行为相关性。在单峰听觉识别任务中，语音声音以视觉字母的全等和非全等组合独立（单峰）或双峰地呈现。此外，视觉字母的质量受到参数控制。我们的分析表明，全等视觉字母的呈现导致识别语音的行为得到改善，与此同时，左上颞沟的皮质反应也得到了类似的调节。在低视觉噪声下，听觉和视觉刺激之间的一致性进一步调节了颞叶和枕颞皮质的皮质反应。在单峰听觉任务（语音识别）过程中，这些性能和皮层反应的交叉模态调制表明，在识字的成人大脑中，字母（拼字法）和语音（音韵）的处理之间存在强大而自动的功能耦合。

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