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Related Concept Videos

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.
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...
Auditory Pathway01:15

Auditory Pathway

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 the...
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.
Hair Cells01:22

Hair Cells

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.
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...

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Related Experiment Video

Updated: Jul 3, 2026

Optogenetic Stimulation of the Auditory Nerve
10:53

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Pitch representations in the auditory nerve: two concurrent complex tones.

Erik Larsen1, Leonardo Cedolin, Bertrand Delgutte

  • 1Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA, USA.

Journal of Neurophysiology
|July 18, 2008
PubMed
Summary
This summary is machine-generated.

Neural codes for pitch perception in cats reveal how the brain processes concurrent sounds. Both firing rate and timing are crucial for distinguishing pitches, even with complex tones.

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Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
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Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities

Published on: January 29, 2014

Related Experiment Videos

Last Updated: Jul 3, 2026

Optogenetic Stimulation of the Auditory Nerve
10:53

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
09:38

Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities

Published on: January 29, 2014

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Computational Auditory Neuroscience

Background:

  • Pitch perception of concurrent sounds is vital for auditory scene analysis and music.
  • Neural mechanisms for distinguishing pitches of multiple simultaneous sounds are not fully understood.

Purpose of the Study:

  • Investigate neural codes for pitch perception of two concurrent harmonic complex tones.
  • Determine the efficacy of rate-place and interspike-interval codes for representing pitches.

Main Methods:

  • Recorded single-fiber activity in cat auditory nerve responding to two concurrent tones.
  • Used scaling invariance in cochlear mechanics to infer spatiotemporal response patterns.
  • Applied peripheral auditory models to estimate fundamental frequencies (F0s) from neural data.

Main Results:

  • Rate-place code accurately represented pitches for fundamental frequencies (F0s) > 900 Hz.
  • Interspike-interval code accurately represented pitches for F0s < 900 Hz.
  • Accurate pitch estimation occurred even without resolved harmonics in the mixture.

Conclusions:

  • Both rate-place and interval-based neural codes contribute to pitch perception of concurrent sounds.
  • These codes effectively cover the pitch range of human and cat vocalizations.
  • Findings advance understanding of neural processing in complex auditory environments.