Distinct sensitivity to spectrotemporal modulation supports brain asymmetry for speech and melody
Distinct sensitivity to spectrotemporal modulation supports brain asymmetry for speech and melody
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DOI：
10.1126/science.aaz3468
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发表时间：
2020-02-28
期刊：
影响因子：
56.9
通讯作者：
Zatorre, Robert J.
中科院分区：
文献类型：
--
作者：
Albouy, Philippe;Benjamin, Lucas;Zatorre, Robert J.
大脑对语言和音乐的不对称性是来自听觉线索还是来自特定领域的神经网络？我们有选择地过滤时间或频谱调制在歌唱语音刺激的口头和旋律的内容是交叉和平衡。语音的感知下降，只有时间信息的退化，而感知的旋律下降，只有频谱退化。功能性磁共振成像数据显示，语音和旋律的神经解码分别取决于左右听觉区域的活动模式。这种不对称性是由对每个区域内的光谱时间调制率的特定敏感性支持的。最后，退化对感知的影响被其对神经分类的影响所抵消。我们的研究结果表明，通信信号的声学特性和适应这一目的的神经专业化之间的匹配。
Does brain asymmetry for speech and music emerge from acoustical cues or from domain-specific neural networks? We selectively filtered temporal or spectral modulations in sung speech stimuli for which verbal and melodic content was crossed and balanced. Perception of speech decreased only with degradation of temporal information, whereas perception of melodies decreased only with spectral degradation. Functional magnetic resonance imaging data showed that the neural decoding of speech and melodies depends on activity patterns in left and right auditory regions, respectively. This asymmetry is supported by specific sensitivity to spectrotemporal modulation rates within each region. Finally, the effects of degradation on perception were paralleled by their effects on neural classification. Our results suggest a match between acoustical properties of communicative signals and neural specializations adapted to that purpose.