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Echo01:06

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...
Convergent Evolution01:54

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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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.
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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Los murciélagos usan la estructura armónica del eco para distinguir a sus objetivos del desorden de fondo.

Mary E Bates1, James A Simmons, Tengiz V Zorikov

  • 1Department of Cognitive, Linguistic, and Psychological Sciences, Box 1853, Brown University, Providence, RI 02912, USA. maryebates@gmail.com

Science (New York, N.Y.)
|July 30, 2011
PubMed
Resumen

Los grandes murciélagos marrones usan ecos armónicos para evitar el desorden confuso, sacrificando la percepción de retraso precisa para una identificación más clara del objetivo en entornos complejos.

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Área de la Ciencia:

  • La bioacústica es la bioacústica.
  • Ecología Sensorial Ecología Sensorial
  • Comportamiento animal Comportamiento animal.

Sus antecedentes:

  • Los murciélagos ecolocadores se enfrentan a desafíos en entornos desordenados, donde los ecos laterales pueden enmascarar los ecos objetivo.
  • Los armónicos primero y segundo de las señales de sonar del murciélago tienen diferentes propiedades de transmisión direccional.

Objetivo del estudio:

  • Para investigar cómo los grandes murciélagos marrones utilizan la información armónica para distinguir entre el objetivo y los ecos de desorden.
  • Comprender la compensación entre la percepción del retraso del eco y la supresión del desorden en la ecolocalización del murciélago.

Principales métodos:

  • Se llevaron a cabo experimentos psicofísicos con grandes murciélagos marrones.
  • La manipulación electrónica de la primera y segunda alineación armónica en ecos artificiales imitaba el procesamiento neuronal de los ecos de desorden.
  • Se evaluó el rendimiento del murciélago en la percepción de retraso de eco y enmascaramiento de desorden.

Principales resultados:

  • La desalineación de armónicos interrumpió la percepción del retraso del eco, pero redujo el enmascaramiento del desorden.
  • El realineamiento de armónicos restauró la percepción de retraso, pero también restableció la interferencia de desorden.
  • Los murciélagos demostraron una estrategia de sacrificar la agudeza de retraso para mitigar el enmascaramiento.

Conclusiones:

  • Los grandes murciélagos marrones explotan las diferencias en el contenido armónico para diferenciar el desorden de los ecos objetivo.
  • Esta explotación armónica permite a los murciélagos mejorar la detección de objetivos en entornos complejos a costa de una resolución de retraso precisa.