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Lack of reproducibility of temporary hearing threshold shifts in a harbor porpoise after exposure to repeated airgun sounds.
The Journal of the Acoustical Society of America ( IF 2.4 ) Pub Date : 2020-08-04 , DOI: 10.1121/10.0001668
Ronald A Kastelein 1 , Lean Helder-Hoek 1 , Suzanne A Cornelisse 1 , Alexander M von Benda-Beckmann 2 , Frans-Peter A Lam 2 , Christ A F de Jong 2 , Darlene R Ketten 3
Affiliation  

Noise-induced temporary hearing threshold shift (TTS) was studied in a harbor porpoise exposed to impulsive sounds of scaled-down airguns while both stationary and free-swimming for up to 90 min. In a previous study, ∼4 dB TTS was elicited in this porpoise, but despite 8 dB higher single-shot and cumulative exposure levels (up to 199 dB re 1 μPa2s) in the present study, the porpoise showed no significant TTS at hearing frequencies 2, 4, or 8 kHz. There were no changes in the study animal's audiogram between the studies or significant differences in the fatiguing sound that could explain the difference, but audible and visual cues in the present study may have allowed the porpoise to predict when the fatiguing sounds would be produced. The discrepancy between the studies may have resulted from self-mitigation by the porpoise. Self-mitigation, resulting in reduced hearing sensitivity, can be achieved via changes in the orientation of the head, or via alteration of the hearing threshold by processes in the ear or central nervous system.

中文翻译:

暴露于反复的气枪声后,海豚海豚的临时听觉阈值变化缺乏再现性。

在暴露于按比例缩小的气枪的冲动声中的海豚海豚中,研究了噪声诱发的暂时性听觉阈移(TTS),静止和自由游泳长达90分钟。在先前的研究中,约为4分贝TTS被引发在该海豚,但尽管8分贝更高的单次和累积暴露水平(高达199分贝重新1 μ2s)在本研究中,海豚在2、4或8 kHz的听力频率下未显示明显的TTS。在研究之间,研究动物的听力图没有变化,也没有解释疲劳声音的明显差异,但可以解释这种差异,但是本研究中的听觉和视觉提示可能使海豚预测了产生疲劳声音的时间。研究之间的差异可能是由于海豚的自我减轻所致。可通过改变头部的方向或通过耳朵或中枢神经系统的过程改变听力阈值来实现自我缓解,从而降低听力敏感性。
更新日期:2020-08-05
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