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Related Concept Videos

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...
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...
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...
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.
Motor and Sensory Areas of the Cortex01:14

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.

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Related Experiment Video

Updated: May 31, 2026

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
09:29

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

Published on: October 11, 2017

Contrast gain control in auditory cortex.

Neil C Rabinowitz1, Ben D B Willmore, Jan W H Schnupp

  • 1Department of Physiology, Anatomy, and Genetics, Sherrington Building, Parks Road, University of Oxford, Oxford OX13PT, UK. neil.rabinowitz@merton.ox.ac.uk

Neuron
|June 22, 2011
PubMed
Summary
This summary is machine-generated.

Neurons in the auditory cortex adjust their sensitivity to sound based on recent acoustic environments. This contrast gain control helps the brain efficiently process complex natural sounds by rescaling neural responses.

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Optogenetic Stimulation of the Auditory Nerve

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Related Experiment Videos

Last Updated: May 31, 2026

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
09:29

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

Published on: October 11, 2017

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
10:51

An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

Published on: March 10, 2011

Optogenetic Stimulation of the Auditory Nerve
10:53

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Area of Science:

  • Neuroscience
  • Auditory System Research
  • Computational Neuroscience

Background:

  • The auditory system processes sounds with diverse statistical properties.
  • Spectrotemporal contrast, the variation in sound pressure across frequency bands, is a key acoustic feature.
  • Understanding how neural circuits adapt to varying contrast is crucial for auditory perception.

Purpose of the Study:

  • To investigate how neurons in the auditory cortex adapt their gain in response to spectrotemporal contrast.
  • To determine the factors influencing contrast gain control in auditory neurons.
  • To explore the functional implications of contrast gain control for efficient sound coding.

Main Methods:

  • Electrophysiological recordings from ferret auditory cortex neurons.
  • Stimulation with controlled spectrotemporal contrast levels.
  • Analysis of neural gain rescaling and response modulation.

Main Results:

  • Auditory cortex neurons rescale their gain to partially compensate for recent spectrotemporal contrast.
  • Low contrast environments lead to increased neural gain, enhancing sensitivity.
  • Gain control effectiveness is reduced at low mean sound levels and influenced by contrast across frequency bands.
  • Neural responses are modulated by contrast over approximately 100 ms timescales.

Conclusions:

  • Contrast gain control is a significant mechanism in the auditory cortex for adapting to acoustic environments.
  • This adaptation allows for a more efficient neural representation of natural sounds.
  • The auditory system dynamically adjusts its sensitivity to optimize information processing.