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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Perception of Sound Waves01:01

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Standing Waves01:17

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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Sound Waves: Resonance01:14

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Hair Cells01:22

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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.
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Voces en el océano

Andrea Ravignani1,2, Christian T Herbst3,4,5

  • 1Comparative Bioacoustics Group, Max Planck Institute for Psycholinguistics, Nijmegen, Netherlands.

Science (New York, N.Y.)
|March 2, 2023
PubMed
Resumen
Este resumen es generado por máquina.

Las ballenas dentadas desarrollaron un nuevo mecanismo de producción de sonido, distinto de los métodos previamente conocidos en mamíferos marinos y vertebrados terrestres. Este descubrimiento revela una tercera vía evolutiva para la vocalización en las ballenas dentadas.

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Área de la Ciencia:

  • Biología marina
  • La bioacústica
  • Biología evolutiva

Sus antecedentes:

  • Las ballenas dentadas (odontocetes) producen sonidos complejos para la ecolocalización y la comunicación.
  • El conocimiento existente identifica dos mecanismos primarios de producción de sonido en los mamíferos: la fonación laríngea (mamíferos terrestres) y los labios fonicos (delfines).
  • Los mecanismos precisos de generación de sonido en algunas especies de ballenas dentadas siguen siendo incompletamente entendidos.

Objetivo del estudio:

  • Para investigar el mecanismo único de producción de sonido en las ballenas dentadas.
  • Identificar las estructuras anatómicas y los procesos fisiológicos involucrados en la generación de sus vocalizaciones.
  • Comparar este mecanismo con los métodos conocidos de producción de sonido en otros vertebrados.

Principales métodos:

  • Se utilizaron técnicas de imagen de alta resolución (por ejemplo, tomografías computarizadas, resonancia magnética) para visualizar el aparato vocal.
  • Se realizaron análisis hidrodinámicos y acústicos de los sonidos grabados.
  • Se realizaron estudios anatómicos comparativos con especies relacionadas.

Principales resultados:

  • Se identificó un nuevo mecanismo de producción de sonido, distinto de la fonación laríngea y los labios fonicos, en las ballenas dentadas.
  • Esta tercera vía involucra estructuras especializadas dentro de las fosas nasales.
  • Las propiedades acústicas de los sonidos generados son únicas y difieren de las producidas por otros mecanismos conocidos.

Conclusiones:

  • Las ballenas dentadas poseen una tercera vía evolutiva independiente para la producción de sonido.
  • Este hallazgo amplía nuestra comprensión de la evolución vocal entre los mamíferos.
  • El mecanismo único destaca la radiación adaptativa y la diversidad dentro de la bioacústica de las ballenas dentadas.