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Hearing

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 Cells

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.

The Cochlea

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.

Anatomy of the Ear

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 Pathway

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...

Perceiving Loudness, Pitch, and Location

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...

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Related Experiment Video

Updated: Apr 4, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Published on: May 10, 2019

What is the cochlear place code for pitch?

J J Zwislocki¹

¹Institute for Sensory Research, Syracuse University.

Acta Oto-Laryngologica

|January 1, 1991

Summary

This summary is machine-generated.

Pitch perception is complex. While cochlear implants focus on excitation location, hair cell recordings show pitch constancy despite intensity-driven location shifts, suggesting a different coding mechanism.

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Last Updated: Apr 4, 2026

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Published on: March 24, 2023

Area of Science:

Neuroscience
Auditory Perception
Bioacoustics

Background:

Cochlear implants have spurred interest in how the cochlea encodes pitch.
The prevailing theory links pitch to the cochlea's excitation maximum location.
Clinical relevance is high due to the increasing use of cochlear implants.

Purpose of the Study:

To investigate the relationship between sound intensity, cochlear excitation patterns, and perceived pitch.
To challenge the excitation maximum theory of pitch coding.
To explore alternative mechanisms for pitch constancy.

Main Methods:

Direct recordings from cochlear hair cells.
Analysis of excitation patterns across varying sound frequencies and intensities.
Correlation of physiological data with psychoacoustic pitch perception.

Main Results:

Cochlear excitation maximum location shifts significantly with sound intensity for a constant frequency.
Perceived pitch remains relatively constant despite these intensity-induced shifts.
A constant high-frequency cutoff of cochlear excitation correlates with pitch constancy.

Conclusions:

The location of the excitation maximum is not the sole determinant of pitch perception.
Pitch constancy may be encoded by the high-frequency cutoff of cochlear excitation.
Findings necessitate a re-evaluation of the cochlear code for pitch, particularly for cochlear implant design.