Development of hearing in the big brown bat
Development of hearing in the big brown bat
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DOI：
10.1007/s00359-020-01452-4
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发表时间：
2020-11-16
影响因子：
2.1
通讯作者：
Faure, Paul A.
中科院分区：
文献类型：
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作者：
Mockel, Doreen;Groulx, Thomas;Faure, Paul A.
我们研究了大棕蝠幼崽的听力发育。大多数幼犬在出生后第7天（PND）或之前打开了两个外耳道，但也有一些幼犬在出生后第11天打开了外耳道。利用重复的听觉脑干反应（ABR）记录，我们每隔3天跟踪22只棕尾蝠幼崽听觉敏感性的逐渐发育和成熟，从PND 10到PND 31，并在2个月、3个月和1岁时对一部分蝙蝠进行了额外的记录。在整个发育过程中，在4到100 kHz之间的频率上，听觉敏感性显著增加，在PND 10到19之间的发育早期，阈值变化最大。在PND 13-16之前，当幼崽仍然不挥发时，大多数蝙蝠无法听到高于48 kHz的频率；然而，随着年龄的增长，对这些高超声波频率的敏感性增加。值得注意的是，这种变化发生在年轻蝙蝠开始学习飞行和回声定位的年龄附近。
We studied the development of hearing in newborn pups of the big brown bat, Eptesicus fuscus. In the majority of pups, the opening of both outer auditory canals occurred on or before postnatal day (PND) 7, but in some, it extended to PND 11. Using repeated auditory brainstem response (ABR) recordings, we tracked the progressive development and maturation of auditory sensitivity in 22 E. fuscus pups every 3 days, from PND 10 to PND 31, with additional recordings in a subset of bats at 2 months, 3 months and 1 year of life. There was a profound increase in auditory sensitivity across development for frequencies between 4 and 100 kHz, with the largest threshold shifts occurring early in development between PND 10 and 19. Prior to PND 13-16 and when pups were still non-volant, most bats were unable to hear frequencies above 48 kHz; however, sensitivity to these higher ultrasonic frequencies increased with age. Notably, this change occurred near the age when young bats started learning how to fly and echolocate.