Auditory Spectral Integration: Complex Sounds and Speech

听觉频谱整合：复杂的声音和语音

• 批准号: 6922418
• 负责人: LAWRENCE L FETH
• 金额: $ 29.9万
• 依托单位: OHIO STATE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6922418
• 关键词: age difference; auditory stimulus; behavioral /social science research tag; clinical research; cochlear implants; ear hair cell; gender difference; human subject; neural information processing; psychoacoustics; sensorineural hearing loss; sound perception; speech recognition

DESCRIPTION (provided by applicant): Auditory spectral integration has been reported, primarily in the speech perception literature, for at least 50 years. Under some conditions, spectral components falling within a critical region of approximately 5 ERBu (3.5 Bark) are processed by the central auditory system so that two or more resonance peaks are approximated by a single peak located at the spectral center-of-gravity, COG, of the original sound. These findings lead to a "resolution vs. integration" paradox for the frequency domain analogous to the "resolution vs. integration" paradox in the time domain (Viemeister, 1996). Recently, Lublinskaja (1996) demonstrated that changing the COG of a two-resonance signal over time leads listeners to hear a frequency transition that follows the dynamic COG. In our previous work, we developed a computational model and applied it to the COG effect for both static and dynamic signals. In the proposed work we will first better define the stimulus parameters that limit listener performance in spectral integration tasks and use our findings to revise and improve the model. To that end, we will assess the effect of uncertainty in signal parameters on performance for both static and dynamic complex sounds. In addition to listeners with normal hearing, we will test listeners with sensori-neural hearing loss due to outer hair cell dysfunction. These studies will help us better understand the spectral integration phenomenon. In addition to the aim of exploring the psychoacoustic aspects of the COG phenomenon, a second specific aim of this project is to address the function, limits and salience of COG effects (broadly defined) within the context of speech perception. This inquiry will take a different approach than that taken by the majority of studies in the literature in that we will not be strictly limiting our manipulations of the acoustic signal to formant frequency, formant amplitudes and/or individual harmonics. If this dynamic COG effect proves to be robust, it may be possible to incorporate it into novel signal processing schemes for cochlear implant users for whom dynamic sounds pose a challenge.

描述（由申请人提供）：至少50年来，主要在语音感知文献中报告了听觉光谱整合。在某些条件下，中央听觉系统处理落在大约5个ERBU（3.5种皮）临界区域内的光谱成分，以使两个或多个共振峰通过位于原始声音的频谱中心COG上的一个峰近似。这些发现导致了类似于时间域中“分辨率与集成”悖论的频域的“分辨率与集成”悖论（Viemeister，1996）。最近，卢布林斯卡（Lublinskaja）（1996）表明，随着时间的流逝，将两种谐波信号的齿轮更改导致听众听到动态齿轮后的频率转变。在以前的工作中，我们开发了一个计算模型，并将其应用于静态和动态信号的COG效应。在拟议的工作中，我们首先将更好地定义刺激参数，这些刺激参数限制了光谱集成任务中的听众性能，并使用我们的发现来修改和改进模型。为此，我们将评估信号参数对静态和动态复杂声音性能的不确定性对性能的影响。除了听力正常的听众外，我们还将测试由于外部毛细胞功能障碍而导致传感神经听力损失的听众。这些研究将帮助我们更好地了解光谱整合现象。除了探索COG现象的心理声学方面的目的外，该项目的第二个具体目的是解决语音感知背景下COG效应的功能，限制和显着性（广泛定义）。该询问将采用与文献中大多数研究相比，我们对声学信号的操纵不会严格地限制为共振体频率，赋端幅度和/或单个谐波。如果这种动态COG效应被证明是可靠的，则有可能将其纳入新型信号处理方案中，以使耳蜗植入物用户为他们的动态听起来带来挑战。