Auditory brainstem responses during aerial testing with bottlenose dolphins (Tursiops truncatus): Effects of electrode and jawphone locations
Auditory brainstem responses during aerial testing with bottlenose dolphins (Tursiops truncatus): Effects of electrode and jawphone locations
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DOI：
10.1121/10.0001123
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发表时间：
2020-04-01
影响因子：
2.4
通讯作者：
Burkard, Robert F.
中科院分区：
文献类型：
--
作者：
Mulsow, Jason;Finneran, James J.;Burkard, Robert F.
在某些情况下（例如搁浅），电生理听力筛查过程中声音向海豚的传输是在水中进行的。这需要使用接触式换能器来传送声音，该接触式换能器要么压在皮肤上，要么使用吸盘固定到下颌（即“颌式耳机”）。本研究研究了宽吻海豚（Tursiops truncatus，n = 3）在空中测试期间听觉脑干反应（ABR）如何随电极和颚式耳机位置的变化而变化。刺激是中心频率为 28 至 160 kHz 的突发音调。在下颌后部和中部使用颚式耳机时，基于回归的阈值最低。基于后来的 ABR 峰值（使用紧靠气孔后面的电极记录）的阈值表明，与基于鼻道附近记录的早期单耳波的阈值相比，讲台前尖和下颌后/中下颌的阈值之间有更多相似性。这可能是双耳响应总和的结果，而不是更有效的耳朵声学路径。这些模式与频率无关。这些发现为检查海豚听力以及在类似测试情况下解释头部的相对声学灵敏度时的颚式耳机和电极位置提供了指导。
Transmission of sound to dolphins during electrophysiological hearing screening is conducted out of water in certain cases (e.g., strandings). This necessitates that sound be delivered using a contact transducer either pressed against the skin or affixed to the jaw using a suction cup (i.e., "jawphones"). This study examined how bottlenose dolphin (Tursiops truncatus, n = 3) auditory brainstem responses (ABRs) varied with electrode and jawphone location during aerial testing. Stimuli were tone bursts with center frequencies of 28 to 160 kHz. Regression-based thresholds were lowest with the jawphone on the posterior and middle parts of the mandible. Thresholds based on later ABR peaks-recorded using an electrode immediately behind the blowhole-suggested more similarity between the thresholds for the anterior tip of the rostrum and the posterior/middle mandible than those based on earlier monaural waves recorded near the meatus. This was likely a result of a summation of responses from both ears as opposed to a more efficient acoustic pathway to the ear. These patterns were independent of frequency. These findings provide guidance for jawphone and electrode locations when examining dolphin hearing and when interpreting relative acoustic sensitivity of the head in similar testing situations.