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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.
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.
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...

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Related Experiment Video

Updated: May 7, 2026

Testing Tactile Masking between the Forearms
08:05

Testing Tactile Masking between the Forearms

Published on: February 10, 2016

Central auditory masking by an illusory tone.

Christopher J Plack1, Andrew J Oxenham, Heather A Kreft

  • 1School of Psychological Sciences, University of Manchester, Manchester, United Kingdom.

Plos One
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

Forward masking, a reduction in sound detectability, may occur in the brainstem. This study shows central auditory processing, specifically in the superior olivary complex, contributes to forward masking effects in humans.

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Last Updated: May 7, 2026

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Auditory Perception

Background:

  • Natural sounds fluctuate, and detectability can decrease due to forward masking.
  • Forward masking is hypothesized to involve neural adaptation or persistence but its location in the auditory pathway is debated.

Purpose of the Study:

  • To investigate the neural locus of forward masking.
  • To determine if central auditory processing contributes to forward masking.

Main Methods:

  • Utilized a Huggins pitch stimulus, which relies on binaural integration in the superior olivary complex.
  • Compared forward masking levels for Huggins pitch stimuli versus spectrally identical, perfectly correlated noise stimuli.

Main Results:

  • Huggins pitch stimuli induced greater forward masking in the decorrelated frequency band compared to correlated stimuli.
  • Peripheral neural representations were identical for both stimulus types, isolating central processing effects.

Conclusions:

  • Central auditory processing, at or beyond the superior olivary complex, plays a role in forward masking.
  • This finding advances understanding of auditory processing and neural mechanisms underlying sound perception.