Influences of auditory object formation on phonemic restoration
Influences of auditory object formation on phonemic restoration
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DOI：
10.1121/1.2804701
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发表时间：
2008-01-01
影响因子：
2.4
通讯作者：
Wang, Dali
中科院分区：
文献类型：
--
作者：
Shinn-Cunningham, Barbara G.;Wang, Dali
在音素恢复中，当噪声填充语音间隙时，中断语音的清晰度会增强。当缺失语音幅度的宽带包络调制介入噪声时，清晰度会更好。然而，这种现象代表了一种感知失败：幅度调制（一种噪声特征）被错误地归因于语音。实验探讨了物体形成是否会影响言语间隙中信息的感知和分配方式。实验 1 重复了这样的发现：当语音调制噪声而不是未调制噪声出现在间隙中时，清晰度会得到增强。在实验2中，中断的语音以不自然的方式呈现，但中间的噪音要么以不自然的方式呈现，要么以耳间时间差引导至右耳，导致听者一侧感知到噪音。当从不同方向感知语音调制噪声和语音时，清晰度不再通过调制而增强。然而，感知位置对未调制噪声没有影响，未调制噪声不包含源自语音的信息。结果表明，增强对象形成可以减少对象之间声学特征的错误分配，并证明我们理解噪声语音的能力取决于一系列交互过程，包括瞥见感官输入、将感官输入分组到对象中，以及通过自上而下的知识解决歧义。 (c) 2008 年美国声学学会。
In phonemic restoration, intelligibility of interrupted speech is enhanced when noise fills the speech gaps. When the broadband envelope of missing speech amplitude modulates the intervening noise, intelligibility is even better. However, this phenomenon represents a perceptual failure: The amplitude modulation, a noise feature, is misattributed to the speech. Experiments explored whether object formation influences how information in the speech gaps is perceptually, allocated. Experiment 1 replicates the finding that intelligibility is enhanced when speech-modulated noise rather than unmodulated noise is presented in the gaps. In Experiment 2, interrupted speech was presented diotically, but intervening noises were presented either diotically or with an interaural time difference leading in the right ear, causing the noises to be perceived to the side of the listener. When speech-modulated noise and speech are perceived from different directions, intelligibility is no longer enhanced by the modulation. However, perceived location has no effect for unmodulated noise, which contains no speech-derived information. Results suggest that enhancing object formation reduces misallocation of acoustic features across objects, and demonstrate that our ability to understand noisy speech depends on a cascade of interacting processes, including glimpsing sensory inputs, grouping sensory inputs into objects, and resolving ambiguity through top-down knowledge. (c) 2008 Acoustical Society of America.