The role of temporal coherence and temporal predictability in the build-up of auditory grouping

The role of temporal coherence and temporal predictability in the build-up of auditory grouping
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时间连贯性和时间可预测性在听觉分组建立中的作用

DOI:
10.1101/2021.06.27.449898
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发表时间:
2021
期刊:
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影响因子:
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通讯作者:
Sollini J
Sollini J
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文献类型:
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作者:
Sollini J

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耳蜗会将声音分解成不同的频率通道,听觉大脑必须从这些通道重建听觉场景。要做到这一点,听觉系统必须决定哪些频率信息应该组合在一起,哪些应该保持不同。分组的两个关键线索是时间一致性和时间可预测性,前者是由频率上功率的相干变化产生的,后者是由随时间规律或可预测的变化产生的。为了测试这些线索如何有助于声音场景的构建,我们向听者呈现了一系列前驱声音,这些先驱声音通过提供关于每个声音结构的信息来启动听觉系统,随后是一个固定的掩蔽器,参与者被要求检测嵌入音调的存在。通过操纵前兆中的时间一致性和/或时间可预测性,我们评估了先前的声音暴露如何影响随后的听觉分组。在实验1中,我们通过呈现时间规则或抖动的前兆来测量时间可预测性的贡献,并通过使用窄音或宽带声音来测量时间连贯性的贡献,表明两者都独立地对掩蔽/去掩蔽做出贡献。在实验2中,我们测量了时间一致性和时间可预测性的相对影响,并询问前兆中每一个的影响是否意味着去掩饰的增强或干扰。我们观察到,干扰前体对阈值产生了最大的变化。
The cochlea decomposes sounds into separate frequency channels, from which the auditory brain must reconstruct the auditory scene. To do this the auditory system must make decisions about which frequency information should be grouped together, and which should remain distinct. Two key cues for grouping are temporal coherence, resulting from coherent changes in power across frequency, and temporal predictability, resulting from regular or predictable changes over time. To test how these cues contribute to the construction of a sound scene we present listeners with a range of precursor sounds, which act to prime the auditory system by providing information about each sounds structure, followed by a fixed masker in which participants were required to detect the presence of an embedded tone. By manipulating temporal coherence and/or temporal predictability in the precursor we assess how prior sound exposure influences subsequent auditory grouping. In Experiment 1, we measure the contribution of temporal predictability by presenting temporally regular or jittered precursors, and temporal coherence by using either narrow or broadband sounds, demonstrating that both independently contribute to masking/unmasking. In Experiment 2, we measure the relative impact of temporal coherence and temporal predictability and ask whether the influence of each in the precursor signifies an enhancement or interference of unmasking. We observed that interfering precursors produced the largest changes to thresholds.
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