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Related Concept Videos

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.
Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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...
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.
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...
Sound Intensity Level00:53

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 hence a...

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Related Experiment Video

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A Method to Study Adaptation to Left-Right Reversed Audition
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Published on: October 29, 2018

Interaural level difference-dependent gain control and synaptic scaling underlying binaural computation.

Xiaorui R Xiong1, Feixue Liang, Haifu Li

  • 1Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.

Neuron
|August 27, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered a "push-pull" mechanism in the brain

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Published on: October 29, 2018

Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Computational Neuroscience

Background:

  • Binaural integration in the central nucleus of the inferior colliculus (ICC) is crucial for sound localization.
  • The precise arithmetic operations and synaptic mechanisms governing binaural integration in the ICC are not fully understood.

Purpose of the Study:

  • To elucidate the synaptic mechanisms underlying binaural integration in mouse ICC neurons.
  • To understand how interaural level differences (ILDs) are encoded and processed for sound localization.

Main Methods:

  • In vivo electrophysiological recordings from mouse ICC neurons.
  • Analysis of synaptic excitation and inhibition balance.
  • Investigation of neuronal responses to varying interaural level differences (ILDs).

Main Results:

  • A "push-pull" mechanism involving contralaterally dominant excitation and balanced inhibition creates contralateral dominance.
  • Binaural responses are generated by ipsilaterally mediated scaling of contralateral responses, preserving frequency tuning.
  • This scaling is due to divisive attenuation of contralateral synaptic excitation, with inhibition largely unaffected.
  • Gain control mediates the linear transformation from monaural to binaural spike responses.
  • ILD modulates gain by scaling excitation levels, enabling dynamic encoding of sound localization cues.

Conclusions:

  • A gain control mechanism, modulated by ILD-dependent synaptic scaling of excitation, underlies binaural integration in the ICC.
  • This process allows for dynamic encoding of sound localization while maintaining invariant representation of other sound attributes.