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首页> 外文期刊>The European Journal of Neuroscience >Hemispheric asymmetry for spectral and temporal processing in the human antero-lateral auditory belt cortex.
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Hemispheric asymmetry for spectral and temporal processing in the human antero-lateral auditory belt cortex.

机译：在人类前外侧听觉带皮层中进行光谱和时间处理的半球不对称性。

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The present study investigates the acoustic basis of the hemispheric asymmetry for the processing of speech and music. Experiments on this question ideally involve stimuli that are perceptually unrelated to speech and music, but contain acoustic characteristics of both. Stimuli in previous studies were derived from speech samples or tonal sequences. Here we introduce a new class of noise-like sound stimuli with no resemblance of speech or music that permit independent parametric variation of spectral and temporal acoustic complexity. Using these stimuli in a functional MRI experiment, we test the hypothesis of a hemispheric asymmetry for the processing of spectral and temporal sound structure by seeking cortical areas in which the blood oxygen level dependent (BOLD) signal covaries with the number of simultaneous spectral components (spectral complexity) or the temporal modulation rate (temporal complexity) of the stimuli. BOLD-responses from the left and right Heschl's gyrus (HG) and part of the rightsuperior temporal gyrus covaried with the spectral parameter, whereas covariation analysis for the temporal parameter highlighted an area on the left superior temporal gyrus. The portion of superior temporal gyrus in which asymmetrical responses are apparent corresponds to the antero-lateral auditory belt cortex, which has been implicated with spectral integration in animal studies. Our results support a similar function of the anterior auditory belt in humans. The findings indicate that asymmetrical processing of complex sounds in the cerebral hemispheres does not depend on semantic, but rather on acoustic stimulus characteristics.
机译：本研究调查了处理语音和音乐的半球不对称的声学基础。理想情况下，有关此问题的实验应包含与语音和音乐无关的刺激，但应同时包含两者的声学特性。以前的研究中的刺激来自语音样本或音调序列。在这里，我们介绍了一类新的类似于噪声的声音刺激，它们与语音或音乐没有相似之处，因此可以实现频谱和时间声学复杂度的独立参数变化。通过在功能性MRI实验中使用这些刺激，我们通过寻找血氧水平依赖性（BOLD）信号与同时频谱分量数量共变的皮质区域，测试了半球不对称性对频谱和时间声音结构处理的假设。频谱复杂度）或刺激的时间调制率（时间复杂度）。左右赫氏回旋（HG）和右上颞回的一部分的BOLD响应与光谱参数共变，而时参的协方差分析突出显示了左上颞回的区域。明显的不对称反应的上颞回的部分对应于前外侧听觉带皮层，这在动物研究中与光谱整合有关。我们的结果支持人类前听带的类似功能。这些发现表明，大脑半球中复杂声音的不对称处理不依赖于语义，而是依赖于声刺激特征。

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