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Related Concept Videos

Echo01:06

Echo

1.1K
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,...
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The Cochlea01:13

The Cochlea

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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.
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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...
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Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Anatomy of the Ear01:16

Anatomy of the Ear

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Hearing01:31

Hearing

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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.
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Related Experiment Video

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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Three-dimensional auditory localization in the echolocating bat.

Melville J Wohlgemuth1, Jinhong Luo1, Cynthia F Moss1

  • 1Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, USA.

Current Opinion in Neurobiology
|September 4, 2016
PubMed
Summary
This summary is machine-generated.

Bats use a sophisticated biological sonar system for precise 3D auditory localization. This system enables them to navigate complex environments and hunt effectively by processing echolocation signals and echoes.

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Area of Science:

  • Bioacoustics
  • Neuroethology
  • Sensory Biology

Background:

  • Echolocating bats possess remarkable three-dimensional (3D) auditory localization capabilities crucial for survival.
  • Their biological sonar system achieves high spatial resolution by integrating multiple sensory inputs.

Purpose of the Study:

  • To elucidate the mechanisms underlying bats' precise 3D auditory localization.
  • To detail the key components and processing strategies of the bat's biological sonar system.

Main Methods:

  • Analysis of echolocation signal characteristics (frequency, directionality).
  • Investigation of auditory system's role in processing inter-aural differences and spectral cues.
  • Examination of neural responses to pulse-echo pairs for time delay measurement.

Main Results:

  • Bats utilize high-frequency, directional echolocation signals and high-frequency hearing.
  • Mobile ears and precise measurement of echo time delay are critical for range computation.
  • Auditory neurons exhibit delay-tuned responses, contributing to spatial representation.

Conclusions:

  • The bat's auditory system integrates azimuth, elevation, and range information for a unified 3D spatial perception.
  • This sophisticated sensory processing allows for accurate obstacle avoidance and prey interception.