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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.
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...
Hair Cells01:22

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.

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Related Experiment Video

Updated: Jul 6, 2026

In Vitro Wedge Slice Preparation for Mimicking In Vivo Neuronal Circuit Connectivity
10:31

In Vitro Wedge Slice Preparation for Mimicking In Vivo Neuronal Circuit Connectivity

Published on: August 18, 2020

Auditory nerve inputs to cochlear nucleus neurons studied with cross-correlation.

E D Young1, M B Sachs

  • 1Department of Biomedical Engineering and Center for Hearing Sciences, 505 Traylor Building, Johns Hopkins University, 720 Rutland Avenue, Baltimore, MD 21205, USA. eyoung@jhu.edu

Neuroscience
|March 18, 2008
PubMed
Summary

Synaptic strength between auditory nerve (AN) fibers and ventral cochlear nucleus (VCN) neurons is crucial for neural integration. Excitatory postsynaptic potentials (EPs) were observed near auditory threshold, indicating a shift to autonomous firing at higher sound levels.

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11:45

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Published on: February 10, 2011

Area of Science:

  • Neuroscience
  • Auditory System Physiology
  • Synaptic Plasticity

Background:

  • Synaptic strength between auditory nerve (AN) fibers and ventral cochlear nucleus (VCN) neurons influences neural integration.
  • Understanding this synaptic connection is key to deciphering auditory processing.

Purpose of the Study:

  • To analyze synaptic strength between AN fibers and VCN neurons in cats.
  • To investigate how synaptic strength varies with VCN neuron type and sound level.

Main Methods:

  • Simultaneous cross-correlation of spike trains from AN fibers and VCN neurons in anesthetized cats.
  • Classification of VCN neurons into chopper, primarylike, and onset types.
  • Analysis of excitatory peaks (EPs) in correlograms.

Main Results:

  • Excitatory peaks (EPs) indicating monosynaptic excitation were found in 49% of AN-VCN pairs with similar best frequencies.
  • EPs were observed only within approximately 20 dB of auditory threshold.
  • Synaptic strength showed little change with varying interspike intervals, suggesting minimal short-term plasticity.

Conclusions:

  • VCN neuron responses shift from a 1:1 AN-VCN spike relationship at low sound levels to autonomous firing at high levels.
  • Synaptic properties are consistent with known VCN neuron morphology and terminal types.
  • Short-term synaptic plasticity plays a limited role in AN-VCN transmission under the studied conditions.