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首页> 外文期刊>The European Journal of Neuroscience >Evidence for early specialized processing of speech formant information in anterior and posterior human auditory cortex.
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Evidence for early specialized processing of speech formant information in anterior and posterior human auditory cortex.

机译：早期和后方人类听觉皮层语音共振峰信息的早期专业处理的证据。

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Many speech sounds, such as vowels, exhibit a characteristic pattern of spectral peaks, referred to as formants, the frequency positions of which depend both on the phonological identity of the sound (e.g. vowel type) and on the vocal-tract length of the speaker. This study investigates the processing of formant information relating to vowel type and vocal-tract length in human auditory cortex by measuring electroencephalographic (EEG) responses to synthetic unvoiced vowels and spectrally matched noises. The results revealed specific sensitivity to vowel formant information in both anterior (planum polare) and posterior (planum temporale) regions of auditory cortex. The vowel-specific responses in these two areas appeared to have different temporal dynamics; the anterior source produced a sustained response for as long as the incoming sound was a vowel, whereas the posterior source responded transiently when the sound changed from a noise to a vowel, or when there was a change in vowel type. Moreover, the posterior source appeared to be largely invariant to changes in vocal-tract length. The current findings indicate that the initial extraction of vowel type from formant information is complete by the level of non-primary auditory cortex, suggesting that speech-specific processing may involve primary auditory cortex, or even subcortical structures. This challenges the view that specific sensitivity to speech emerges only beyond unimodal auditory cortex.
机译：许多语音（例如元音）表现出频谱峰的特征模式，称为共振峰，其频率位置既取决于声音的语音身份（例如元音类型），也取决于扬声器的声道长度。 。本研究通过测量对合成清音元音和频谱匹配噪声的脑电图（EEG）响应，研究与人类听觉皮层中元音类型和声道长度有关的共振峰信息的处理。结果表明，在听觉皮层的前（平极）和后（平颞）区域中，元音共振峰信息具有特定的敏感性。在这两个区域中，元音特定的响应似乎具有不同的时间动态。只要传入的声音是元音，前声源就会产生持续的响应，而当声音从噪声变为元音或元音类型发生变化时，后声源会做出短暂的响应。此外，后部来源似乎在声道长度的变化方面基本不变。当前的发现表明，从共振峰信息中元音类型的初始提取是通过非主要听觉皮层的水平完成的，这表明语音特定处理可能涉及主要听觉皮层，甚至皮层下结构。这对以下观点提出了挑战：对语音的特定敏感性仅出现在单峰听觉皮层以外。

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