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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.

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Related Experiment Video

Updated: May 10, 2026

Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

Published on: June 6, 2012

Frequency discrimination in ears with and without contralateral cochlear dead regions.

Peder O Laugen Heggdal¹, Ola Lind, K Jonas Brännström

¹Department of Audiology, Haukeland University Hospital, Bergen, Norway. pederheggdal@gmail.com

International Journal of Audiology

|June 22, 2013

Summary

In adults with bilateral high-frequency hearing loss, unilateral dead regions improved low-frequency discrimination, especially at 0.5 kHz. This suggests a contralateral effect influencing sound perception.

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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

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Published on: December 20, 2024

Area of Science:

Audiology
Auditory Neuroscience
Hearing Science

Background:

Bilateral high-frequency hearing loss is common.
Cochlear dead regions can impact hearing abilities.
Understanding frequency discrimination is crucial for hearing rehabilitation.

Purpose of the Study:

To assess frequency discrimination of low-frequency tones in individuals with bilateral high-frequency hearing loss.
To investigate the influence of contralateral cochlear dead regions on this ability.
To explore the relationship between hearing loss characteristics and frequency discrimination.

Main Methods:

Cochlear dead regions were identified using the TEN-HL test.
Frequency discrimination was measured using an adaptive three-alternative forced choice method.
Difference limens were determined for 0.25 kHz and 0.5 kHz pure-tone stimuli.

Main Results:

Ears with dead regions demonstrated superior performance in frequency discrimination.
Significantly better discrimination was observed at 0.5 kHz for ears with a contralateral dead region compared to those without.
The opposite trend was noted at 0.25 kHz.

Conclusions:

Unilateral dead regions may exert a contralateral effect on low-frequency discrimination in adults with bilateral high-frequency hearing loss.
This effect is frequency-dependent, being more pronounced at 0.5 kHz.
Findings contribute to understanding complex auditory processing in hearing loss.