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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.

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 identifying...

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.

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 the...

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Related Experiment Video

Updated: Jun 25, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Limits of temporal pitch in cochlear implants.

Ying-Yee Kong¹, John M Deeks, Patrick R Axon

¹Department of Speech Language Pathology & Audiology, Northeastern University, Boston, Massachusetts 02115, USA. yykong@neu.edu

The Journal of the Acoustical Society of America

|March 12, 2009

Summary

Cochlear implant users showed optimal electrical stimulation rate discrimination at medium rates (200-300 pulses per second). This finding differs from previous research, suggesting a unique performance pattern for Med-El device users.

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Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Cochlear implant (CI) research typically indicates an upper limit of approximately 300 pulses per second (pps) for rate discrimination.
Understanding the optimal stimulation rates is crucial for improving speech perception and sound quality in CI users.

Purpose of the Study:

To investigate electrical stimulation rate discrimination across various baseline rates in Med-El C40+ cochlear implant users.
To compare the performance of Med-El CI users with Nucleus CI24 users to identify device-specific differences.

Main Methods:

A two-interval forced-choice procedure was used to assess rate discrimination.
Standard stimulus rates included 100, 200, 300, 400, and 500 pps, with signal rates presented at a percentage higher than the standard.
The study involved eight Med-El C40+ subjects and compared results to eight Nucleus CI24 listeners.

Main Results:

Six out of eight Med-El subjects demonstrated peak performance at medium rates (200-300 pps), performing worse at lower (100 pps) and higher (400-500 pps) rates.
This performance pattern was consistent across different psychophysical methods and stimulus types (amplitude-modulated pulse trains).
Med-El users showed superior performance at 300 pps and above compared to Nucleus users, but slightly poorer performance at 100 pps.

Conclusions:

Med-El CI users exhibit a non-monotonic rate discrimination function, peaking at mid-range stimulation rates.
These findings challenge the conventional understanding of rate discrimination limits in cochlear implants.
The results have implications for optimizing electrical stimulation strategies and understanding temporal pitch perception in different CI devices.