Frequency Clustering in Spontaneous Otoacoustic Emissions from a Lizard's Ear
Frequency Clustering in Spontaneous Otoacoustic Emissions from a Lizard's Ear
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DOI：
10.1529/biophysj.108.130286
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发表时间：
2008-11-15
影响因子：
3.4
通讯作者：
Duke, Thomas
中科院分区：
文献类型：
--
作者：
Vilfan, Andrej;Duke, Thomas
自发耳声发射（soae）是内耳活动过程的指标，该过程增强了听觉的灵敏度和频率选择性。它们在某些蜥蜴身上特别规律和健壮，因此这些动物是研究soae如何产生的良好模式生物。我们表明，已发表的短尾蜥蜴soae的性质与一个数学模型完全一致，其中具有指数变化特征频率的有源振荡器通过粘弹性元件耦合在一起。从物理上讲，每个振荡器对应于一小群毛细胞，这些毛细胞被一个覆盖层覆盖，因此我们的理论分析直接将soae与活跃毛束的微观力学联系起来。
Spontaneous otoacoustic emissions (SOAEs) are indicators of an active process in the inner ear that enhances the sensitivity and frequency selectivity of hearing. They are particularly regular and robust in certain lizards, so these animals are good model organisms for studying how SOAEs are generated. We show that the published properties of SOAEs in the bobtail lizard are wholly consistent with a mathematical model in which active oscillators, with exponentially varying characteristic frequencies, are coupled together in a chain by visco-elastic elements. Physically, each oscillator corresponds to a small group of hair cells, covered by a tectorial sallet, so our theoretical analysis directly links SOAEs to the micromechanics of active hair bundles.