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Related Concept Videos

Hearing01:31

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.
Convergent Evolution01:54

Convergent Evolution

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.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
Anatomy of the Ear01:16

Anatomy of the Ear

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...
Auditory Perception01:17

Auditory Perception

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 cochlea, a...
The Cochlea01:13

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.
The Auditory Ossicles01:11

The Auditory Ossicles

The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...

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Related Experiment Video

Updated: Jun 22, 2026

A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds
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Published on: November 26, 2012

On hearing with more than one ear: lessons from evolution.

Jan W H Schnupp1, Catherine E Carr

  • 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK. jan.schnupp@dpag.ox.ac.uk

Nature Neuroscience
|May 28, 2009
PubMed
Summary
This summary is machine-generated.

Having two ears offers significant advantages for hearing. This review explores binaural processing in birds and mammals, informing future auditory prosthetic development.

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Evolutionary Biology

Background:

  • The independent evolution of hearing organs across diverse species.
  • The prevalence of paired ears in most hearing animals.
  • The functional significance of binaural hearing.

Purpose of the Study:

  • To review the advantages of having two ears.
  • To compare binaural processing strategies in birds and mammals.
  • To explore applications for auditory prosthetic devices.

Main Methods:

  • Literature review of existing research on binaural hearing.
  • Comparative analysis of auditory processing in different taxa.
  • Exploration of potential technological applications.

Main Results:

  • Two ears provide benefits for sound localization and detection.
  • Birds and mammals exhibit both shared and distinct binaural processing mechanisms.
  • Understanding natural binaural hearing can guide prosthetic design.

Conclusions:

  • Binaural hearing offers evolutionary advantages.
  • Comparative studies reveal conserved and divergent auditory strategies.
  • Insights from animal hearing can inspire novel auditory prosthetics.