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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.

Perception of Sound Waves

Perception of Sound Waves

The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...

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...

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.

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Related Experiment Video

Updated: Jul 6, 2025

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

CompHEAR: A Customizable and Scalable Web-Enabled Auditory Performance Evaluation Platform for Cochlear Implant Sound

Kris Merrill¹, Leah Muller¹, Jordan A Beim²

¹Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco.

Biorxiv : the Preprint Server for Biology

|January 8, 2024

Summary

The CompHEAR platform allows researchers to test new cochlear implant (CI) sound processing strategies efficiently. This open-source tool enables large-scale auditory experiments, advancing CI technology and improving patient outcomes.

Keywords:

CompHEAR cochlear implants digital signal processing hackathon research platform sound processing vocoder simulations

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Area of Science:

Auditory Neuroscience
Biomedical Engineering
Human-Computer Interaction

Background:

Cochlear implants (CIs) offer significant hearing restoration but face limitations in testing new sound processing strategies.
Current research interfaces hinder rapid innovation due to portability, programming challenges, and lack of direct algorithm comparison.

Approach:

Introduced CompHEAR, an open-source, user-friendly research platform for cochlear implant auditory experiments.
Utilizes a vocoder to simulate novel sound coding strategies and a flexible architecture for diverse experimental designs.
Designed for scalability, supporting large-scale testing and real-time performance metrics.

Key Points:

CompHEAR successfully enabled global collaboration during the COVID-19 pandemic for the CI Hackathon.
Platform performance testing confirmed support for over 10,000 concurrent users.
Facilitates efficient comparison of diverse signal processing strategies through crowdsourced evaluation.

Conclusions:

CompHEAR is a versatile tool for advancing cochlear implant research and development.
Its ease of use, scalability, and flexibility accelerate the testing of new sound processing algorithms.
Aims to promote significant advancements in CI performance and enhance patient hearing outcomes.