Loudness adaptation in acoustic and electric hearing.
Loudness adaptation in acoustic and electric hearing.
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声学和电学听力中的响度适应。
DOI：
10.1007/s10162-005-0023-6
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Zeng,Fan-Gang
中科院分区：
文献类型：
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作者：
Tang,Qing;Liu,Sheng;Zeng,Fan-Gang
本研究旨在评估和比较听力正常和人工耳蜗植入者的响度适应。在三个频率（125，1，000和8，000 Hz）和三个水平（30，60和90 dB SPL）下，测量了5名听力正常受试者对367 s纯音的响度适应。此外，在三种刺激速率（100、991和4，296 Hz）、三个水平（电动态范围的10%、50%和90%）、三个刺激位置（顶端、中间和基底）和两种刺激模式（单极和双极）下，在五名Clarion人工耳蜗植入受试者中测量了367 s脉冲串的响度适应。采用连续幅度估计的方法对响度适应进行量化。与之前的研究结果相似，我们发现听力正常者的响度适应随着音量的降低和频率的增加而增加。然而，我们也发现了一个小的，但显着的响度增强在90分贝声压级的听觉。尽管个体差异很大，但我们发现耳蜗植入受试者的响度适应随着水平的降低而增加，但受刺激的速率、位置和模式的影响并不显著。提出了一个现象学模型来预测声听觉中响度适应与刺激频率和刺激强度的关系。目前的研究结果不完全符合限制性兴奋假说或神经适应假说。响度适应可以具有取决于外围激励模式的中心分量。
The present study is aimed to evaluate and compare loudness adaptation between normal hearing and cochlear-implant subjects. Loudness adaptation for 367-s pure tones was measured in five normal-hearing subjects at three frequencies (125, 1,000, and 8,000 Hz) and three levels (30, 60, and 90 dB SPL). In addition, loudness adaptation for 367-s pulse trains was measured in five Clarion cochlear-implant subjects at three stimulation rates (100, 991, and 4,296 Hz), three levels (10, 50, and 90% of the electric dynamic range), three stimulation positions (apical, middle and basal), and two stimulation modes (monopolar and bipolar). The method of successive magnitude estimation was used to quantify loudness adaptation. Similar to the previous results, we found that loudness adaptation in normal-hearing subjects increases with decreasing level and increasing frequency. However, we also found a small but significant loudness enhancement at 90 dB SPL in acoustic hearing. Despite large individual variability, we found that loudness adaptation in cochlear-implant subjects increases with decreasing levels, but is not significantly affected by the rate, place and mode of stimulation. A phenomenological model was proposed to predict loudness adaptation as a function of stimulus frequency and level in acoustic hearing. The present results were not fully compatible with either the restricted excitation hypothesis or the neural adaptation hypothesis. Loudness adaptation may have a central component that is dependent on the peripheral excitation pattern.