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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...

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 frequency...

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...

Nonlinear Pharmacokinetics: Causes of Nonlinearity

Nonlinear Pharmacokinetics: Causes of Nonlinearity

Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...

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Related Experiment Video

Updated: Jul 11, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Published on: May 10, 2019

Low-frequency and high-frequency cochlear nonlinearity in humans.

Michael P Gorga¹, Stephen T Neely, Darcia M Dierking

¹Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA. gorga@boystown.org

The Journal of the Acoustical Society of America

|October 12, 2007

Summary

Cochlear nonlinearity differs between low and high frequencies. Distortion Product Otoacoustic Emissions (DPOAEs) reveal a wider dynamic range and greater cochlear amplifier gain at 4 kHz compared to 0.5 kHz in normal-hearing individuals.

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

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Published on: June 6, 2012

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Last Updated: Jul 11, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Published on: May 10, 2019

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

Area of Science:

Auditory Neuroscience
Otoacoustic Emissions
Hearing Physiology

Background:

Cochlear nonlinearity is crucial for auditory perception.
Distortion Product Otoacoustic Emissions (DPOAEs) are widely used to assess cochlear function.
Understanding frequency-dependent cochlear mechanics is essential for diagnosing hearing loss.

Purpose of the Study:

To investigate low- and high-frequency cochlear nonlinearity.
To compare Distortion Product Otoacoustic Emission (DPOAE) input/output functions at 0.5 kHz and 4 kHz.
To evaluate potential differences in cochlear amplifier gain and dynamic range across frequencies.

Main Methods:

Measured DPOAE input/output (I/O) functions in 103 normal-hearing subjects at 0.5 kHz and 4 kHz.
Utilized behavioral hearing thresholds to set stimulus levels (L2) relative to sensation level (SL).
Optimized primary stimulus levels (L1) to maximize DPOAE magnitude for each subject and frequency.

Main Results:

Mean DPOAE I/O functions showed significant differences between 0.5 kHz and 4 kHz, even after accounting for threshold.
DPOAE I/O function slopes were similar at high input levels (approx. 4:1 compression).
Maximum slope near DPOAE threshold (approx. 1) occurred at lower stimulus levels for 4 kHz compared to 0.5 kHz.

Conclusions:

Results suggest a wider dynamic range and potentially greater cochlear amplifier gain at 4 kHz versus 0.5 kHz.
These findings imply frequency-dependent differences in cochlear processing.
Further research is needed to fully interpret slope measures and control for noise level influences.