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Related Concept Videos

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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Auditory Perception01:17

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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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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

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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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Related Experiment Video

Updated: Mar 16, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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Comparative Auditory Neuroscience: Understanding the Evolution and Function of Ears.

Geoffrey A Manley1

  • 1Cochlear and Auditory Brainstem Physiology, Department of Neuroscience, School of Medicine and Health Sciences, Cluster of Excellence "Hearing4all", Research Centre Neurosensory Science, Carl von Ossietzky University Oldenburg, Carl von Ossietzky Strasse 9-11, 26129, Oldenburg, Germany. geoffrey.manley@uni-oldenburg.de.

Journal of the Association for Research in Otolaryngology : JARO
|August 20, 2016
PubMed
Summary

Comparative auditory studies reveal evolutionary trends in vertebrate hearing organs. Mammalian hearing shows remarkable diversity in size and frequency range, unlike lizards and birds.

Keywords:
amniotebirdcochleaevolutionhearinghumanlizard

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Auditory science

Background:

  • Tympanic middle ears evolved independently in land vertebrates during the Mesozoic era.
  • Over millions of years, lizard, bird, and mammal auditory organs enlarged, increasing upper frequency limits.
  • Despite cellular differences, hearing sensitivity and frequency selectivity are similar across these groups.

Purpose of the Study:

  • To investigate the evolutionary origins and performance variations of vertebrate auditory systems.
  • To compare the development and characteristics of hearing organs in lizards, birds, and mammals.
  • To explore the unique auditory adaptations in the human lineage.

Main Methods:

  • Comparative analysis of auditory organ morphology across vertebrate lineages.
  • Examination of cochlear size and upper frequency limits in extant species.
  • Investigation of cellular structure and functional hearing parameters (sensitivity, selectivity).

Main Results:

  • Avian papillae reached 11 mm, while lizard papillae remained small (<2 mm), both with upper frequencies near 12 kHz.
  • Mammalian hearing organs exhibit over tenfold size variation (up to >70 mm) and frequency limits from 12 to >200 kHz.
  • Human ancestors enlarged the cochlea and lowered upper frequency limits; modern humans display unique frequency selectivity patterns.

Conclusions:

  • Vertebrate auditory evolution demonstrates convergent and divergent adaptations in size and frequency tuning.
  • Mammalian auditory systems show exceptional diversity, likely driven by varied ecological pressures and physiological constraints.
  • Human auditory evolution, particularly frequency selectivity, may be linked to speech development.