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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.

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...

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.

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.

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...

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...

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Related Experiment Video

Updated: Feb 26, 2026

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Published on: October 11, 2024

Temporal Envelope Coding by Inferior Colliculus Neurons with Cochlear Implant Stimulation.

Kenneth E Hancock^1,2, Yoojin Chung^3,4, Martin F McKinney⁵

¹Eaton-Peabody Laboratories, Massachusetts Eye and Ear, Boston, MA, 02114, USA. ken_hancock@meei.harvard.edu.

Journal of the Association for Research in Otolaryngology : JARO

|July 19, 2017

Summary

Cochlear implants (CIs) process sound differently than natural hearing. This study reveals how neurons in the auditory system of cats with CIs respond to complex sound envelopes, finding varied preferences and precise but limiting timing responses.

Keywords:

cochlear implants inferior colliculus temporal coding temporal envelope

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Last Updated: Feb 26, 2026

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Published on: October 11, 2024

Performing Intracochlear Electrocochleography During Cochlear Implantation

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Published on: March 8, 2022

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Published on: January 9, 2019

Area of Science:

Neuroscience
Auditory Processing
Cochlear Implants

Background:

Temporal envelope modulations are crucial for natural sound perception.
Cochlear implants (CIs) often omit temporal fine structure, relying on envelope processing.
Previous studies used simplified sinusoidal amplitude modulation (SAM), limiting understanding of natural sound envelope representation.

Purpose of the Study:

To characterize temporal envelope processing in the inferior colliculus (IC) of cats with CIs.
To investigate neural responses to complex envelope shapes beyond pure SAM.
To understand how CI-mediated envelope coding compares to normal hearing (NH).

Main Methods:

Utilized amplitude-modulated, high-rate pulse trains with independently manipulated envelope parameters (burst width, repetition rate).
Recorded neural activity from inferior colliculus (IC) neurons in barbiturate-anesthetized cats with CIs.
Analyzed firing rates and phase-locking to different envelope shapes.

Main Results:

IC neurons exhibited diverse preferences for envelope parameters, with most favoring short bursts and low repetition rates.
Pure SAM was generally ineffective.
Neurons phase-locked precisely to the envelope peak, irrespective of shape, potentially degrading coding.
A model suggested inhibitory and intrinsic mechanisms explain response variations.

Conclusions:

Neural processing of temporal envelopes in CI users is complex and varied.
Precise phase-locking to envelope peaks may limit the neural representation of envelope shape.
Findings highlight differences between CI and normal hearing auditory processing.