宽吻海豚（瓶鼻海豚）对调频“啁啾”刺激的听觉脑干反应。

Bottlenose dolphin (Tursiops truncatus) auditory brainstem responses to frequency-modulated "chirp" stimuli.

作者信息

Finneran James J, Mulsow Jason, Jones Ryan, Houser Dorian S, Burkard Robert F

机构信息

U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific Code 71510, 53560 Hull Street, San Diego, California 92152, USA.

National Marine Mammal Foundation, 2240 Shelter Island Drive #200, San Diego, California 92106, USA.

出版信息

J Acoust Soc Am. 2017 Aug;142(2):708. doi: 10.1121/1.4996721.

DOI:10.1121/1.4996721

PMID:28863591

Abstract

Previous studies have demonstrated that increasing-frequency chirp stimuli (up-chirps) can enhance human auditory brainstem response (ABR) amplitudes by compensating for temporal dispersion occurring along the cochlear partition. In this study, ABRs were measured in two bottlenose dolphins (Tursiops truncatus) in response to spectrally white clicks, up-chirps, and decreasing-frequency chirps (down-chirps). Chirp durations varied from 125 to 2000 μs. For all stimuli, frequency bandwidth was constant (10-180 kHz) and peak-equivalent sound pressure levels (peSPLs) were 115, 125, and 135 dB re 1 μPa. Up-chirps with durations less than ∼1000 μs generally increased ABR peak amplitudes compared to clicks with the same peSPL or energy flux spectral density level, while down-chirps with durations from above ∼250 to 500 μs decreased ABR amplitudes relative to clicks. The findings generally mirror those from human studies and suggest that the use of chirp stimuli may be an effective way to enhance broadband ABR amplitudes in larger marine mammals.

摘要

先前的研究表明，增加频率的啁啾刺激（上调啁啾）可以通过补偿沿耳蜗隔板发生的时间弥散来增强人类听觉脑干反应（ABR）的幅度。在本研究中，对两只宽吻海豚（瓶鼻海豚）进行了ABR测量，以响应频谱白色咔嗒声、上调啁啾和降低频率的啁啾（下调啁啾）。啁啾持续时间从125到2000微秒不等。对于所有刺激，频率带宽是恒定的（10 - 180千赫），峰值等效声压级（peSPL）为115、125和135分贝相对于1微帕。与具有相同peSPL或能量通量谱密度水平的咔嗒声相比，持续时间小于约1000微秒的上调啁啾通常会增加ABR峰值幅度，而持续时间从约250到500微秒以上的下调啁啾相对于咔嗒声会降低ABR幅度。这些发现总体上与人类研究的结果相似，并表明使用啁啾刺激可能是增强大型海洋哺乳动物宽带ABR幅度的有效方法。