ACOUSTIC TRAUMA - SINGLE NEURON BASIS FOR THE HALF-OCTAVE SHIFT
ACOUSTIC TRAUMA - SINGLE NEURON BASIS FOR THE HALF-OCTAVE SHIFT
复制标题
DOI：
10.1121/1.386906
复制
发表时间：
1981-01-01
影响因子：
2.4
通讯作者：
JOHNSTONE, BM
中科院分区：
文献类型：
--
作者：
CODY, AR;JOHNSTONE, BM
暴露在强烈的纯音中会导致[豚鼠]听觉灵敏度的丧失。如果这种损失恢复，脱敏被认为是一个暂时的阈值偏移（TTS）。在单个听觉神经元水平上，这种TTS被监测为神经元最敏感或特征频率（CF）的灵敏度丧失。当纯音暴露的频率间隔测量从神经元CF，频率低于CF半个倍频程是最有效的诱导CF TTS。所有的曝光频率高于半个倍频程以下的CF产生显着减少TTS的增长与强度相比，较低的曝光频率。随着高于1/2倍频程点的曝光频率的增加，产生给定TTS所需的强度比神经元敏感性增长得更快。在1/2倍频程点以下，所有曝光频率的行为类似。在其他研究中发现的TTS和机械和神经非线性的频率特定的要求之间存在很强的相似性。显然，1/2倍频程移位可能是基底膜非线性的直接结果。
Exposure to an intense pure tone can induce a loss of [guinea pig] hearing sensitivity. If this loss recovers, the desensitization is regarded as a temporary threshold shift (TTS). At the single auditory neuron level this TTS was monitored as a loss of sensitivity at the neuron''s most sensitive or characteristic frequency (CF). When pure-tone exposures were presented at frequency intervals measured from the neuron CF, a frequency half an octave below the CF was the most effective for inducing a CF TTS. All exposure frequencies higher than half an octave below the CF produce a marked reduction in TTS growth with intensity, when compared to lower exposure frequencies. With increasing exposure frequency higher than the 1/2-octave point, the intensity needed to produce a given TTS grew faster than the neuron sensitivity. Below the 1/2-octave point all exposure frequencies behave similarly. Strong similarities exist between the frequency-specific requirements for TTS and the mechanical and neural nonlinearities found in other studies. Apparently the 1/2-octave shift may be a direct result of basilar membrane nonlinearities.