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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.

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...

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.

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...

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...

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Related Experiment Video

Updated: Feb 19, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Published on: February 19, 2014

Encoding of natural timbre dimensions in human auditory cortex.

Emily J Allen¹, Michelle Moerel², Agustín Lage-Castellanos³

¹Department of Psychology, University of Minnesota, Minneapolis, MN 55455, United States.

|October 30, 2017

Summary

This study reveals how the brain processes sound quality (timbre). A new model based on subjective timbre dimensions accurately predicts auditory cortex responses, outperforming models based on physical sound features.

Keywords:

Auditory cortex Encoding models Music Perception Timbre

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Published on: October 22, 2015

Area of Science:

Neuroscience
Auditory Perception
Psychoacoustics

Background:

Timbre, or sound quality, is vital for understanding speech, music, and environmental sounds, yet its neural basis remains poorly understood.
Current models often use physical sound characteristics to explain neural representations, but may not fully capture perceptual qualities.

Purpose of the Study:

To investigate the cortical representation of different timbral dimensions.
To test a novel encoding model based on subjective timbre dimensions against existing models.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
An encoding model based on five subjectively derived dimensions of timbre was developed and tested.
The model's predictions of cortical responses to natural orchestral sounds were compared with other models.

Main Results:

The proposed timbre model outperformed models based solely on spectral characteristics.
The timbre model performed comparably to a complex joint spectrotemporal modulation model.
In specific auditory cortical regions (medial Heschl's gyrus and posterior adjacency), the timbre model surpassed even the complex spectrotemporal model.

Conclusions:

Cortical neuronal populations in the auditory cortex may encode perceptual timbre dimensions.
Subjective timbre dimensions provide a valuable framework for understanding auditory cortical processing.
This research advances our understanding of how the brain represents complex sound qualities.