Voice selectivity in the temporal voice area despite matched low-level acoustic cues.
Voice selectivity in the temporal voice area despite matched low-level acoustic cues.
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DOI：
10.1038/s41598-017-11684-1
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发表时间：
2017-09-14
影响因子：
4.6
通讯作者：
Belin P
中科院分区：
文献类型：
--
作者：
Agus TR;Paquette S;Suied C;Pressnitzer D;Belin P
在人类听者中，颞语音区（TVA）是上级颞回和沟的区域，对有声声音的反应比一系列非有声控制声音（包括杂乱的声音，环境噪音和动物叫声）的反应更大。TVA的选择性的一种解释是基于低水平的声学线索：与控制声音相比，人声可能具有更强的谐波含量或更大的频谱时间复杂性。在这里，我们表明，正确的TVA仍然有选择性的人的声音，即使占各种声学线索。使用功能磁共振成像，单元音刺激与平衡的谐波噪声比和音高的乐器的单音符进行了对比。我们还使用了“听觉嵌合体”，它保留了人声的声学特征的子集。右侧TVA仅对自然人声优先激活。特别是，TVA没有更多的反应，人工嵌合体保留确切的光谱轮廓的声音。额外的声学测量，包括时间调制和频谱复杂性，不能解释增加的激活。这些观察排除了简单的声学线索作为TVA中声音选择性的基础。
In human listeners, the temporal voice areas (TVAs) are regions of the superior temporal gyrus and sulcus that respond more to vocal sounds than a range of nonvocal control sounds, including scrambled voices, environmental noises, and animal cries. One interpretation of the TVA’s selectivity is based on low-level acoustic cues: compared to control sounds, vocal sounds may have stronger harmonic content or greater spectrotemporal complexity. Here, we show that the right TVA remains selective to the human voice even when accounting for a variety of acoustical cues. Using fMRI, single vowel stimuli were contrasted with single notes of musical instruments with balanced harmonic-to-noise ratios and pitches. We also used “auditory chimeras”, which preserved subsets of acoustical features of the vocal sounds. The right TVA was preferentially activated only for the natural human voice. In particular, the TVA did not respond more to artificial chimeras preserving the exact spectral profile of voices. Additional acoustic measures, including temporal modulations and spectral complexity, could not account for the increased activation. These observations rule out simple acoustical cues as a basis for voice selectivity in the TVAs.
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