The effect of acoustic shielding of the region of a dolphin's mental foramina on its hearing sensitivity

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY

St Petersburg Polytechnic University Journal-Physics and Mathematics Pub Date : 2016-10-01 DOI:10.1016/j.spjpm.2016.08.003

Vyacheslav A. Ryabov

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引用次数: 1

Abstract

The effect of acoustic shielding of the mental foramina of a bottlenose dolphin (Tursiops truncatus) on its auditory thresholds has been experimentally studied using the method of instrumental conditioned reflexes with food reinforcement. The detection thresholds of short broadband acoustic pulses deteriorated significantly (by 30–50 dB) under conditions of acoustic shielding in the region of the mental foramina over the whole frequency band of the dolphin's hearing. Therefore, the mental foramina of its lower jaw take part in receiving and conducting the sounds into the mandibular fat in the entire frequency range of the dolphin's hearing. The obtained results give an experimental proof for the assumption that the morphological structures of the lower jaw play a role of the peripheral part of a dolphin's hearing. Now there are grounds to assume that Odontoceti have the similar peripheral part of their hearing. This assumption is based on the similarity of their morphology.

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海豚脑孔区域的声学屏蔽对其听觉灵敏度的影响

采用食物强化条件反射的方法，研究了宽吻海豚(Tursiops truncatus)脑孔声屏蔽对其听觉阈值的影响。在听觉的整个频带内，在脑孔区屏蔽声的情况下，短宽带声脉冲的检测阈值显著下降(下降30 ~ 50 dB)。因此，它的下颌的精神孔参与接收和引导声音进入下颌脂肪在整个频率范围内的海豚的听觉。实验结果证明了海豚下颚的形态结构在听觉的外围部分起作用的假设。现在有理由假设齿齿鲸有类似的外围听力部分。这个假设是基于它们形态的相似性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

St Petersburg Polytechnic University Journal-Physics and Mathematics PHYSICS, MULTIDISCIPLINARY-

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