Sound-diffracting flap in the ear of a bat generates spatial information
Sound-diffracting flap in the ear of a bat generates spatial information
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DOI：
10.1103/physrevlett.100.108701
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发表时间：
2008-03-14
影响因子：
8.6
通讯作者：
Buck, John R.
中科院分区：
文献类型：
--
作者：
Mueller, Rolf;Lu, Hongwang;Buck, John R.
哺乳动物耳朵的声音衍射产生源方向信息。我们已经从数值预测中得到了这一信息的直接量化。我们证明了我们的方法的力量，通过显示一个小皮瓣在蝙蝠的耳廓产生有用的信息，在一个中心频带的频率在一个大的方向集：皮瓣的存在增加了一倍以上的立体角与方向信息高于给定的阈值。从工作的信息措施，克拉美-拉奥下限，我们可以解释物理形状是如何通过一个强大的旁瓣与频率相关的方向性模式的方向性与感官信息。这种方法可以应用于任何其他哺乳动物物种与pinnacious量化耳廓结构的贡献的相对重要性的方向信息，并促进种间比较的耳廓方向性模式。
Sound diffraction by the mammalian ear generates source-direction information. We have obtained an immediate quantification of this information from numerical predictions. We demonstrate the power of our approach by showing that a small flap in a bat's pinna generates useful information over a large set of directions in a central band of frequencies: presence of the flap more than doubled the solid angle with direction information above a given threshold. From the workings of the employed information measure, the Cramer-Rao lower bound, we can explain how physical shape is linked to sensory information via a strong sidelobe with frequency-dependent orientation in the directivity pattern. This method could be applied to any other mammal species with pinnae to quantify the relative importance of pinna structures' contributions to directional information and to facilitate interspecific comparisons of pinna directivity patterns.