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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.

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.

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...

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Related Experiment Video

Updated: Jun 10, 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

Cochlear implant users experience the sound-to-music effect.

Anna V Kasdan^1,2, Iliza M Butera¹, Andrea J DeFreese³

¹Vanderbilt Brain Institute, Vanderbilt University, Nashville, TN, USA.

Auditory Perception & Cognition

|October 11, 2024

Summary

This summary is machine-generated.

Cochlear implant (CI) users can experience the sound-to-music effect, where repeated sounds are perceived as musical. However, this effect is less pronounced in CI users compared to those with normal hearing, highlighting the role of temporal cues.

Keywords:

cochlear implants music sound-to-music effect speech-to-song illusion

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Optogenetic Stimulation of the Auditory Nerve

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

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Area of Science:

Auditory perception
Neuroscience
Audiology

Background:

The speech-to-song and sound-to-music illusions demonstrate how repetition can induce musical percepts.
Cochlear implant (CI) users face significant challenges in perceiving music due to physiological and device-related limitations.

Purpose of the Study:

To investigate whether repetition can elicit musical percepts in CI users.
To compare the magnitude of the sound-to-music effect in CI users versus normal-hearing (NH) individuals.

Main Methods:

Thirty adult CI users and 30 age-matched NH controls participated.
Two repetition experiments were conducted using speech and nonspeech sounds (water droplets).
Participants rated the perceived musicality of repeated sounds.

Main Results:

CI users experienced the sound-to-music effect, but to a lesser degree than NH participants.
Musicality ratings were not correlated with musical training, frequency resolution, or duration of hearing loss in CI users.
Temporal/rhythmic cues appear sufficient for the sound-to-music effect with limited spectral information.

Conclusions:

Temporal processing plays a crucial role in the sound-to-music effect, even with limited spectral information provided by cochlear implants.
Tailored music incorporating short repetitions may enhance musical experiences for CI users.