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Related Concept Videos

Hearing01:31

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 Location01:21

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...
Auditory Pathway01:15

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 Cochlea01:13

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.
Auditory Perception01:17

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 Waves01:01

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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Temporal integration of infrasound at threshold.

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The effect of sensorineural hearing loss on suprathreshold perception of tonal components in noise.

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Modelling suppression and comodulation masking release using the dual-resonance nonlinear filter.

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Effect of Contralateral Noise on Speech Intelligibility.

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Related Experiment Video

Updated: Jul 11, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
10:50

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

Published on: February 19, 2014

Peripheral and central aspects of auditory across-frequency processing.

Stephan M A Ernst1, Jesko L Verhey

  • 1AG Neurosensorik, Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26111 Oldenburg, Germany. stephan.ernst@uni-oldenburg.de

Brain Research
|September 11, 2007
PubMed
Summary
This summary is machine-generated.

The auditory system uses across-frequency information to group sounds. This study suggests peripheral processing significantly contributes to comodulation masking release (CMR) and comodulation detection difference (CDD).

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Related Experiment Videos

Last Updated: Jul 11, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
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Published on: February 19, 2014

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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Published on: May 10, 2019

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Natural sounds like speech exhibit shared level fluctuations across frequencies.
  • The auditory system is thought to leverage this spectro-temporal information for auditory object formation.
  • The precise physiological mechanisms underlying across-frequency processing remain incompletely understood.

Purpose of the Study:

  • To differentiate the roles of peripheral and central auditory processing in across-frequency sound analysis.
  • To investigate the contributions of peripheral versus central mechanisms to specific psychoacoustic phenomena.
  • To model and experimentally validate the processing of spectro-temporal cues for auditory grouping.

Main Methods:

  • Utilized psychophysical experiments focusing on comodulation masking release (CMR) and comodulation detection difference (CDD).
  • Developed computational models to predict auditory system responses to spectro-temporal modulations.
  • Compared model predictions with empirical data from human listeners.

Main Results:

  • A significant portion of CMR and CDD effects can be explained by peripheral auditory processing alone.
  • Model predictions aligned well with experimental findings, supporting peripheral contributions.
  • Experimental results with ambiguous across-frequency cues further corroborated the role of peripheral processing.

Conclusions:

  • Peripheral auditory processing plays a substantial role in enabling the auditory system to compare information across frequencies.
  • The findings provide insights into the early stages of auditory scene analysis and sound object formation.
  • The study highlights the importance of peripheral mechanisms in auditory perception of complex sounds.