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Related Concept Videos

The Cochlea01:13

The Cochlea

52.6K
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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Hair Cells01:22

Hair Cells

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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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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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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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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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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

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Mammalian cochlea as a physics guided evolution-optimized hearing sensor.

Tom Lorimer1, Florian Gomez1, Ruedi Stoop1

  • 1Institute of Neuroinformatics and Institute of Computational Science, University of Zurich and ETH Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.

Scientific Reports
|July 29, 2015
PubMed
Summary
This summary is machine-generated.

Nonlinear physics shaped the mammalian cochlea for pitch perception, challenging purely genetic explanations for hearing sensor uniformity. This physics also explains variations in hearing across amniotic species.

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Area of Science:

  • Bioacoustics
  • Nonlinear Physics
  • Evolutionary Biology

Background:

  • The uniform structure of the mammalian cochlea is often attributed to genetics.
  • The precise physical mechanisms driving the evolution of hearing are not fully understood.

Purpose of the Study:

  • To investigate the role of nonlinear physics in the evolutionary development of the mammalian cochlea.
  • To explore how nonlinear physics influences pitch perception and variations in hearing sensors.

Main Methods:

  • Mesoscopic description level analysis of hearing sensor evolution.
  • Modeling nonlinear sound detection mechanisms.

Main Results:

  • Nonlinear physics was crucial for the unique cochlear design in mammals, enabling pitch perception.
  • This physical principle challenges the notion that genetics alone dictates hearing sensor uniformity.
  • Scalable and non-scalable nonlinear sound detector arrangements may explain inter-species hearing differences.

Conclusions:

  • Nonlinear physics is a key driver in the evolution of the mammalian cochlea and pitch perception.
  • Evolutionary pressures leveraging nonlinear physics, not just genetics, shaped mammalian hearing.
  • Understanding nonlinear acoustics offers insights into the diversity of amniotic hearing systems.