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首页> 外文期刊>Journal of the Association for Research in Otolaryngology: JARO >The spatial buildup of compression and suppression in the mammalian cochlea
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The spatial buildup of compression and suppression in the mammalian cochlea

机译：哺乳动物耳蜗压缩和抑制的空间积累

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We recorded responses of the gerbil basilar membrane (BM) to wideband tone complexes. The intensity of one component was varied and the effects on the amplitude and phase of the others were assessed. This suppression paradigm enabled us to vary probe frequency and suppressor frequency independently, allowing the use of simple scaling arguments to analyze the spatial buildup of the nonlinear interaction between traveling waves. Most suppressors had the same effects on probe amplitude and phase as did wideband intensity increments. The main exception were suppressors above the characteristic frequency (CF) of the recording location, for which the frequency range of most affected probes was not constant, but shifted upward with suppressor frequency. BM displacement reliably predicted the effectiveness of low-side suppressors, but not high-side suppressors. We found "anti-suppression" of probes well below CF, i.e., suppressor-induced enhancement of probe response amplitude. Large (>1 cycle) phase effects occurred for above-CF probes. Phase shifts varied nonmonotonically, but systematically, with suppressor level, probe frequency, and suppressor frequency, reconciling apparent discrepancies in the literature. The analysis of spatial buildup revealed an accumulation of local effects on the propagation of the traveling wave, with larger BM displacement reducing the local forward gain. The propagation speed of the wave was also affected. With larger BM displacement, the basal portion of the wave slowed down, while the apical part sped up. This framework of spatial buildup of local effects unifies the widely different effects of overall intensity, low-side suppressors, and high-side suppressors on BM responses.
机译：我们记录了沙鼠基底膜（BM）对宽带音复合体的反应。一种成分的强度发生变化，并评估了另一种成分对振幅和相位的影响。这种抑制范例使我们能够独立改变探头频率和抑制器频率，从而允许使用简单的缩放参数来分析行波之间非线性相互作用的空间累积。大多数抑制器对探头幅度和相位的影响与宽带强度增量的影响相同。主要的例外是高于记录位置特征频率（CF）的抑制器，大多数受影响的探头的频率范围不是恒定的，而是随着抑制器频率向上移动。 BM位移可靠地预测了低侧抑制器的有效性，但没有预测高侧抑制器的有效性。我们发现远低于CF的探针“抗抑制”，即抑制物诱导的探针响应幅度的增强。 CF探头上方出现较大的（> 1个周期）相位影响。相移随抑制器电平，探头频率和抑制器频率非单调但系统地变化，从而消除了文献中的明显差异。对空间积累的分析表明，对行波传播的局部效应是累积的，较大的BM位移会降低局部的前向增益。波的传播速度也受到影响。随着较大的BM位移，波的基部速度减慢，而根部加快。这种局部效应空间累积的框架统一了总体强度，低侧抑制器和高侧抑制器对BM反应的广泛不同的影响。

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