Behavioral Measures of Cochlear Gain Reduction Depend on Precursor Frequency, Bandwidth, and Level.
Behavioral Measures of Cochlear Gain Reduction Depend on Precursor Frequency, Bandwidth, and Level.
复制标题
人工耳蜗增益的行为度量取决于前体频率，带宽和水平。
DOI：
10.3389/fnins.2021.716689
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发表时间：
2021
影响因子：
4.3
通讯作者：
Strickland EA
中科院分区：
文献类型：
--
作者：
DeRoy Milvae K;Strickland EA
感觉系统适应环境以保持对变化的敏感性。在听觉系统中，内侧耳蜗反射（MOCR）是一种已知的能够进行这种调节的生理机制。MOCR在脑干和耳蜗之间提供传出反馈，减少耳蜗对声音的反应增益。MOCR的感知效应还没有被很好地理解，例如增益减少如何取决于人类听者的引出子特征。生理和行为数据表明，同侧MOCR调谐仅比传入纤维稍微宽一点，并且纤维反馈到刺激它们的耳蜗频率区域。然而，一些耳声发射（OAE）数据表明，噪音是一种比尖锐调谐更有效的激发剂，并且耳蜗的广泛区域可能参与激发。如果在以信号频率为中心的耳蜗通道中处理激发子，则增益降低随激发子水平的增长将取决于激发子的频率含量。在当前的研究中，研究了前一个声音（称为前驱声）的频率含量和水平对信号阈值的影响。结果表明，信号阈值随着前驱体电平的增加而增加，在信号频率处的音调前驱体比在信号频率下近一个倍频的音调前驱体斜率更小。宽带噪声仅比信号频率上的音调略有效，其斜率相对较浅，与信号频率上的音调前体相似。总的来说，这些结果表明，在信号耳蜗处的激励，无论激发子频率如何，都决定了同侧耳蜗增益降低的幅度，并且随着激发子水平的增加而增加。
Sensory systems adjust to the environment to maintain sensitivity to change. In the auditory system, the medial olivocochlear reflex (MOCR) is a known physiological mechanism capable of such adjustment. The MOCR provides efferent feedback between the brainstem and cochlea, reducing cochlear gain in response to sound. The perceptual effects of the MOCR are not well understood, such as how gain reduction depends on elicitor characteristics in human listeners. Physiological and behavioral data suggest that ipsilateral MOCR tuning is only slightly broader than it is for afferent fibers, and that the fibers feed back to the frequency region of the cochlea that stimulated them. However, some otoacoustic emission (OAE) data suggest that noise is a more effective elicitor than would be consistent with sharp tuning, and that a broad region of the cochlea may be involved in elicitation. If the elicitor is processed in a cochlear channel centered at the signal frequency, the growth of gain reduction with elicitor level would be expected to depend on the frequency content of the elicitor. In the current study, the effects of the frequency content and level of a preceding sound (called a precursor) on signal threshold was examined. The results show that signal threshold increased with increasing precursor level at a shallower slope for a tonal precursor at the signal frequency than for a tonal precursor nearly an octave below the signal frequency. A broadband noise was only slightly more effective than a tone at the signal frequency, with a relatively shallow slope similar to that of the tonal precursor at the signal frequency. Overall, these results suggest that the excitation at the signal cochlear place, regardless of elicitor frequency, determines the magnitude of ipsilateral cochlear gain reduction, and that it increases with elicitor level.
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影响因子：
2.8
作者：
GUINAN, JJ;GIFFORD, ML
通讯作者：
GIFFORD, ML
影响因子：
2.4
作者：
DeRoy Milvae, Kristina;Alexander, Joshua M.;Strickland, Elizabeth A.
通讯作者：
Strickland, Elizabeth A.
影响因子：
2.5
作者：
Lilaonitkul, Watjana;Guinan, John J., Jr.
通讯作者：
Guinan, John J., Jr.
DOI：
10.1007/s10162-009-0163-1
发表时间：
2009-09-01
影响因子：
2.4
作者：
Lilaonitkul, Watjana;Guinan, John J., Jr.
通讯作者：
Guinan, John J., Jr.
影响因子：
2.8
作者：
Francis, Nikolas A.;Guinan, John J., Jr.
通讯作者：
Guinan, John J., Jr.