Low frequency eardrum directionality in the barn owl induced by sound transmission through the interaural canal
Low frequency eardrum directionality in the barn owl induced by sound transmission through the interaural canal
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DOI：
10.1007/s00422-016-0689-3
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发表时间：
2016-10-01
影响因子：
1.9
通讯作者：
Wagner, Hermann
中科院分区：
文献类型：
--
作者：
Kettler, Lutz;Christensen-Dalsgaard, Jakob;Wagner, Hermann
鸟类的中耳通常由形成颅管的耳间腔连接。以这种方式联接的鼓膜可以用作压差接收器而不是压力接收器。由此，鼓膜振动变得固有地定向。仓鸮也有一个很大的耳间通道，但它在仓鸮听力中的作用，特别是在声音定位方面，迄今为止一直存在争议。我们在这里讨论现有的数据和在这个物种中的耳间通道的作用，并添加一个新的数据集，通过激光多普勒测振仪在自由场设置。在低频率下，穿过耳间管的显著声音传输发生。声音传输在1.5至3.5 kHz的窄带中引起相当大的鼓膜方向性。这是低于仓鸮用于定位猎物的频率范围，但可以想象的是用于定位同种呼叫者。
The middle ears of birds are typically connected by interaural cavities that form a cranial canal. Eardrums coupled in this manner may function as pressure difference receivers rather than pressure receivers. Hereby, the eardrum vibrations become inherently directional. The barn owl also has a large interaural canal, but its role in barn owl hearing and specifically in sound localization has been controversial so far. We discuss here existing data and the role of the interaural canal in this species and add a new dataset obtained by laser Doppler vibrometry in a free-field setting. Significant sound transmission across the interaural canal occurred at low frequencies. The sound transmission induces considerable eardrum directionality in a narrow band from 1.5 to 3.5 kHz. This is below the frequency range used by the barn owl for locating prey, but may conceivably be used for locating conspecific callers.