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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...

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 Perception

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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...

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...

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: Jun 4, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Characterizing auditory processing and perception in individual listeners with sensorineural hearing loss.

Morten L Jepsen¹, Torsten Dau

¹Centre for Applied Hearing Research, Department of Electrical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. mlj@elektro.dtu.dk

The Journal of the Acoustical Society of America

|February 10, 2011

Summary

This study examined sensorineural hearing loss in ten individuals, finding significant differences in supra-threshold measures despite similar audiograms. A computational model partially explained these variations, highlighting its potential for understanding complex hearing impairments.

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Area of Science:

Auditory Neuroscience
Psychoacoustics
Computational Auditory Modeling

Background:

Sensorineural hearing loss (SHL) presents diverse supra-threshold deficits.
Individual variability in SHL complicates prediction and treatment.
Understanding the link between audiometric data and perceptual performance is crucial.

Purpose of the Study:

To characterize individual differences in supra-threshold auditory abilities in listeners with SHL.
To evaluate a computational model's ability to predict individual performance based on audiometric and cochlear function.
To explore the utility of a personalized auditory model for complex auditory tasks.

Main Methods:

Psychoacoustic testing including audiometry, cochlear compression, frequency selectivity, temporal resolution, and intensity discrimination.
Utilized a computational model of auditory signal processing and perception.
Adjusted cochlear processing parameters based on individual audiograms and basilar-membrane input-output functions.

Main Results:

Listeners with similar audiograms exhibited significant variability in supra-threshold measures.
The model accurately predicted frequency selectivity and forward masking performance.
The model underestimated the variability in intensity discrimination thresholds across listeners.

Conclusions:

Individualized auditory models can partially account for supra-threshold performance variations in SHL.
Personalized model parameters are valuable for studying effects of hearing impairment in complex scenarios.
Further model refinement may be needed to capture all aspects of individual auditory perception.