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Related Concept Videos

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...

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...

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

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...

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Related Experiment Video

Updated: May 24, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Ecological soundscapes viewed through auditory cortical representationsa).

Shihab Shamma^1,2

¹Electrical and Computer Engineering, Institute for Systems Research, University of Maryland College Park, Maryland 20742, USA.

The Journal of the Acoustical Society of America

|May 22, 2026

Summary

This study introduces a multiresolution cortical representation for analyzing environmental sounds. This neurophysiologically inspired method offers an effective way to understand complex soundscapes for preservation and enjoyment.

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain

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Published on: October 11, 2017

Area of Science:

Auditory Neuroscience
Acoustics
Signal Processing

Background:

Environmental sounds are complex and challenging to characterize.
Efficiently tracking sound evolution or contrasting sounds is difficult.
Existing methods may not fully capture perceptual relevance.

Purpose of the Study:

To propose a novel method for characterizing environmental sounds.
To leverage auditory neurophysiology and psychoacoustics for sound analysis.
To create a perceptually relevant representation of soundscapes.

Main Methods:

Utilizing a multiresolution "cortical" representation.
Mimicking the hierarchical analysis of the auditory pathway.
Applying principles from neurophysiological and psychoacoustical studies.

Main Results:

The proposed representation effectively characterizes complex environmental sounds.
It allows for tracking sound evolution over time.
It enables effective contrast between different sound environments.

Conclusions:

The multiresolution cortical representation is an effective tool for soundscape analysis.
This approach aids in enjoying, preserving, and preventing degradation of sound environments.
It provides a perceptually relevant understanding of our auditory surroundings.