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Related Concept Videos

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...

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 the...

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.

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...

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Related Experiment Video

Updated: Jun 1, 2026

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals

Published on: May 23, 2017

Harmonic relationships influence auditory brainstem encoding of chords.

Frederic Marmel¹, Alexandra Parbery-Clark, Erika Skoe

¹Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois, USA. frederic.marmel@gmail.com

|June 14, 2011

Summary

Listeners

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Area of Science:

Neuroscience
Auditory Perception
Music Cognition

Background:

Cortical processing of music relies on sensitivity to harmonic relationships.
Subcortical and cortical auditory processing interact dynamically.
Experience-dependent auditory perception is shaped by this interaction.

Purpose of the Study:

To investigate if subcortical processing of musical sounds is influenced by harmonic relationships.
To explore the role of implicit musical knowledge in early auditory processing.

Main Methods:

Auditory brainstem responses (ABRs) were measured.
Stimuli included chords preceded by harmonically related, unrelated, or repeated chords.
Participants included both musicians and nonmusicians.

Main Results:

Higher spectral response magnitudes were observed in the related chord condition compared to unrelated or repeated conditions.
This effect was present in both musician and nonmusician listeners.
Suggests implicit processing of musical structure at the subcortical level.

Conclusions:

Subcortical auditory processing is sensitive to harmonic relationships in music.
Listeners' implicit knowledge of musical regularities impacts subcortical auditory processing.
This finding deepens understanding of the neural basis of music perception.