Mechanically coupled ears for directional hearing in the parasitoid fly Ormia ochracea
Mechanically coupled ears for directional hearing in the parasitoid fly Ormia ochracea
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DOI：
10.1121/1.413830
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发表时间：
1995-12-01
影响因子：
2.4
通讯作者：
Hoy, RR
中科院分区：
文献类型：
--
作者：
Miles, RN;Robert, D;Hoy, RR
本文分析了赭胸实蝇耳对声场的机械响应。这种动物表现出非凡的能力，可以检测入射声音刺激的方向，尽管它的声学感觉器官彼此非常接近。这种紧密的接近使得声压到达双耳的时间小于1到2 μ S，这取决于声波的传播方向。这两种压力的微小差异必须由动物处理，以确定声音的入射方向。在这只苍蝇中，耳朵靠得很近，它们实际上是由一个表皮结构连接起来的，表皮结构机械地耦合它们的运动，随后放大了耳间的差异。使用表皮结构作为耦合耳朵以实现方向敏感性的手段是新颖的，并且在以前的定向听力研究中没有报道。提出了一个分析模型的机械响应的耳朵的声音刺激，支持声称机械耳间耦合是关键，这种动物的能力，本地化声源。具有一定范围的入射方向的声场的预测结果，并发现同意非常好的测量。(C)1995年美国声学学会。
An analysis is presented of the mechanical response to a sound field of the ears of the parasitoid fly Ormia ochracea. This animal shows a remarkable ability to detect the direction of an incident sound stimulus even though its acoustic sensory organs are in very close proximity to each other. This close proximity causes the arrival times of the sound pressures at the two ears to be less than 1 to 2 mu S depending on the direction of propagation of the sound wave. The small differences in these two pressures must be processed by the animal in order to determine the incident direction of the sound. In this fly, the ears are so close together that they are actually joined by a cuticular structure which couples their motion mechanically and subsequently magnifies interaural differences. The use of a cuticular structure as a means to couple the ears to achieve directional sensitivity is novel and has not been reported in previous studies of directional hearing. An analytical model of the mechanical response of the ear to a sound stimulus is proposed which supports the claim that mechanical interaural coupling is the key to this animal's ability to localize sound sources. Predicted results for sound fields having a range of incident directions are presented and are found to agree very well with measurements. (C) 1995 Acoustical Society of America.