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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.

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...

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...

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: Dec 31, 2025

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Electrophonic Hearing and Cochlear Implants.

Arne Risberg¹, Eva Agelfors¹, Bo Lindström²

¹Department of Speech Communication and Music Acoustics, Royal Institute of Technology (KTH), Stockholm, Sweden.

Acta Oto-Laryngologica

|January 8, 2020

Summary

Cochlear implant outcomes vary due to two distinct electrical stimulation effects: hair cell stimulation (electrophonic) and auditory nerve stimulation (electro-neural). This explains differing patient results and guides future device selection.

Keywords:

patient selection speech coding total deafness

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Last Updated: Dec 31, 2025

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

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

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Published on: August 4, 2023

Area of Science:

Audiology
Biomedical Engineering
Neuroscience

Background:

Speech understanding in cochlear implant (CI) patients with single-channel electrodes shows unexplained variability.
Existing research struggles to account for performance differences among CI users and research groups.

Purpose of the Study:

To investigate a hypothesis explaining variable CI outcomes based on dual auditory sensations from electrical stimulation.
To explore the impact of remaining cochlear hair cells on patient outcomes.

Main Methods:

Review and discussion of published results from studies using the Vienna/3M cochlear implant.
Analysis of auditory sensations resulting from electrophonic and electro-neural stimulation components.

Main Results:

Electrical stimulation can elicit two distinct auditory sensations: electrophonic (hair cell-mediated) and electro-neural (nerve-mediated).
The presence of functional hair cells significantly influences patient outcomes and perception.

Conclusions:

The dual-sensation hypothesis offers a framework for understanding variable CI performance.
Patient selection, electrode placement (extra- vs. intracochlear), and speech coding strategies may need refinement based on these findings.