関連する実験動画
Updated: Jul 9, 2026

08:51
In Vivo Calcium Imaging of Lateral-line Hair Cells in Larval Zebrafish
Published on: November 28, 2018
まとめ
ボトルの鼻のイルカは,口笛やクリックを含む複雑な音の放射を発生します. 実験では,これらの音は,複雑さにもかかわらず,ナビゲーションや認識のために使用されていないことが示されています.
科学分野:
- マリン・バイオロジーの海洋生物学
- バイオアコースティクス バイオアコースティクス
- 動物のコミュニケーション 動物のコミュニケーション
背景:
- ボトルの鼻のイルカ (Tursiops truncatus) は,複雑な声を出しています.
- イルカの音声生成を理解することは,海洋哺乳類のコミュニケーションの研究の鍵です.
研究 の 目的:
- イルカの音波を分析し,分類する.
- 拘束されたイルカで異なる音のクラスを誘発することを調査する.
- ナビゲーションと認識における特定の音の役割を排除する.
主な方法:
- イルカの音の3つのクラスのグラフィカル表示:シナプス波の口笛,クリック,複雑な波.
- 単体およびペアで拘束された動物の音響の観測.
- ナビゲーション,レンジング,および認識 (ソナー) のための鳴き声の実験的除去.
主要な成果:
- サイヌ波の笛は4000Hzから18,000Hzまでの周波数帯です.
- クリックには,口笛の範囲内やそれ以上の周波数が含まれています.
- 複雑な波は,高振幅と幅広い周波数成分を特徴とする.
- 複数の音質クラスの同時発射は,さまざまな状況で観察されました.
結論:
- ボトルノースイルカの発声は様々なもので,口笛,クリック,複雑な波などがあります.
- 実験では,研究された文脈でのソナー機能のための鳴き声の使用は排除されました.
- これらの複雑な音響放射の伝達機能を完全に理解するには,さらなる研究が必要です.
関連する概念動画
Hearing
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
Hair Cells
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
The Cochlea
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Communication
Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
Echo
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Nose and Nasal Cavity
The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...

