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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...

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...

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...

Sound Intensity Level

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...

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 25, 2025

A Method to Study Adaptation to Left-Right Reversed Audition

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Do whole-body vibrations affect spatial hearing?

Ilja Frissen¹, Catherine Guastavino

¹a School of Information Studies, Centre for Interdisciplinary Research on Music Media and Technology (CIRMMT), McGill University , 3661 Peel street, Montréal , Québec , Canada , H3A 1X1.

|May 3, 2014

Summary

This summary is machine-generated.

Whole-body vibrations, common in vehicles, do not reliably affect spatial hearing. Three experiments found no significant impact of vibration frequency or magnitude on sound localization or lateralization performance.

Keywords:

exposure assessment sound lateralisation sound localisation whole-body vibration

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Last Updated: Dec 25, 2025

A Method to Study Adaptation to Left-Right Reversed Audition

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Whole Body Vibration Methods with Survivors of Polio

Whole Body Vibration Methods with Survivors of Polio

Published on: October 17, 2018

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects

Published on: September 1, 2016

Area of Science:

Auditory perception
Human-computer interaction
Vibration effects

Background:

Auditory interfaces use sound spatialization for information display.
Whole-body vibrations are prevalent in environments like vehicles.
The impact of vibrations on spatial hearing is not well understood.

Purpose of the Study:

Investigate the effect of vertical whole-body vibrations on spatial hearing.
Determine if vibration frequency and magnitude influence sound localization and lateralization.

Main Methods:

Conducted three experiments using free-field and headphone-based tasks.
Tested narrow-band noise localization with 5 Hz vibration.
Assessed sound lateralization with varying vibration frequencies (4-8 Hz) and magnitudes (0.83-1.65 ms⁻²).

Main Results:

None of the experiments demonstrated a reliable effect of whole-body vibrations on localization performance.
Neither vibration frequency nor magnitude significantly impacted spatial hearing accuracy.

Conclusions:

Low-frequency whole-body vibrations do not appear to impair spatial hearing.
Findings suggest auditory spatialization in interfaces is robust to typical vehicular vibrations.