Effects of age on speech understanding in normal hearing listeners: Relationship between the auditory efferent system and speech intelligibility in noise
Effects of age on speech understanding in normal hearing listeners: Relationship between the auditory efferent system and speech intelligibility in noise
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DOI：
10.1016/j.specom.2006.03.004
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发表时间：
2006-07-01
影响因子：
3.2
通讯作者：
Frisina, D. Robert
中科院分区：
文献类型：
--
作者：
Kim, SungHee;Frisina, Robert D.;Frisina, D. Robert
人类听众能够在其他对话和背景噪音中听到一个声音。虽然这一过程的神经机制还没有得到很好的理解，但越来越多的证据表明，位于脑干中的内侧橄榄耳蜗（MOC）听觉传出系统通过调制耳蜗（内耳）主动生理机制参与噪声中信号的检测，例如语音。本研究探讨了MOC传出（反馈）的影响，揭示了在畸变产物耳声发射（DPOAEs）和空间分离的影响，在背景噪声中的语音感知。噪声中语音的空间分离和DPOAE的对侧抑制（CS）都涉及到内耳的神经机制。我们试图确定这些任务是否可能是相关的，从而代表参与的能力，听一个声音中的并发谈话和背景噪音，在这种情况下，老年听众有很大的困难。噪音测试中的听力（HINT）[尼尔森，M.，索利，南达科他州，沙利文，J.A.，1994..噪声中听力测试的发展，用于测量安静和噪声中的言语接收阈值。J. Acoust. Soc.Amer.95，1085-1099]用于获得噪声中语音的掩蔽释放（RFM）估计。DPOAE用于测量宽带噪声引入到目标耳（CS）对侧耳的影响。在这两个领域都发现了显着的年龄效应。噪声中的言语知觉（RFM）与DPOAE的CS程度之间存在显著的相关性。RFM仅与年龄和CS在1-2 kHz的DPOAE窄带频率显着相关;成功的言语感知的关键频带。这些发现表明，MOC传出系统和RFM背后的神经机制是相关的，并有助于通常被称为“鸡尾酒会效应”的声源确定。(C)2006 Elsevier B. V.保留所有权利。
Human listeners are able to listen to one voice in the midst of other conversations and background noise. Although the neural mechanisms for this process are not well understood, there is growing evidence that the medial olivocochlear (MOC) auditory efferent system located in the brainstem is involved in the detection of signals in noise, such as speech sounds, by modulating cochlear (inner ear) active physiological mechanisms. The present study examined MOC efferent (feedback) effects as revealed in distortion product otoacoustic emissions (DPOAEs) and effects of spatial separation for speech perception in background noise. Both spatial separation of speech in noise and contralateral suppression (CS) of DPOAE invoke neural mechanisms central to the inner ear. We sought to determine whether these tasks might be related and thereby represent involvement in the ability to listen to one voice in the midst of concurrent conversation and background noise; a situation in which elderly listeners have great difficulty. The Hearing in the Noise Test (HINT) [Nilsson, M., Soli, S.D., Sullivan, J.A., 1994.. Development of the hearing in noise test for the measurement of speech reception thresholds in quiet and in noise. J. Acoust. Soc. Amer. 95, 1085-1099] was used to obtain release from masking (RFM) estimates of speech in noise. DPOAEs were used to measure effects of broadband noise introduced to the ear contralateral to the target ear (CS). Significant age effects were found in both domains. Significant correlations resulted between speech perception in noise (RFM) and the degree of CS of DPOAEs. RFM was significantly related only to age and CS at the DPOAE narrow-band frequency of 1-2 kHz; a frequency band critical for successful speech perception. These findings suggest that the MOC efferent system and neural mechanisms underlying RFM are related and contribute to sound source determination commonly referred to as the "cocktail party effect". (C) 2006 Elsevier B.V. All rights reserved.