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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

6.9K
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...
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The Cochlea01:13

The Cochlea

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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.
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Hearing01:31

Hearing

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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.
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Synaptic Signaling01:09

Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
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Electrical Synapses01:28

Electrical Synapses

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
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Updated: Jan 5, 2026

Optogenetic Stimulation of the Auditory Nerve
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Optogenetic Stimulation of the Auditory Nerve

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Electrical stimulation induces synaptic changes in the peripheral auditory system.

Qiang Li1,2, Tianhao Lu1,2, Chen Zhang1,2

  • 1Department of Otolaryngology & Head-Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, China.

The Journal of Comparative Neurology
|October 29, 2019
PubMed
Summary
This summary is machine-generated.

Electrical stimulation from cochlear implants (CIs) can harm auditory nerve function and reduce inner hair cell synapses. This neurostimulation effect is crucial for patients with residual hearing, necessitating further research into chronic stimulation impacts.

Keywords:
RRID: AB_2113875RRID: AB_2535764RRID: AB_2535776RRID: AB_399431cochlear implantelectrical stimulationelectrically evoked compound action potential, ECAPinner hair cellsspiral ganglion neuronsynapse

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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Biomedical Engineering

Background:

  • Neurostimulation devices, including cochlear implants (CIs), are increasingly used to modulate neural functions.
  • The precise impact of CI electrical stimulation on inner hair cell (IHC) synapses and residual hearing is not fully understood.
  • CI candidacy now includes patients with partial hearing loss, some of whom experience progressive hearing loss post-activation.

Purpose of the Study:

  • To investigate the acute effects of intracochlear electrical stimulation on the auditory nerve and IHC synapses in normal-hearing guinea pigs.
  • To determine if electrical stimulation impacts spiral ganglion neuron (SGN) morphology or hair cell quantity.
  • To provide insights into the mechanisms of hearing loss associated with CI use in patients with residual hearing.

Main Methods:

  • Normal-hearing guinea pigs were surgically implanted with customized CIs.
  • Intracochlear electrical stimulation was applied at intensities at or above the electrically evoked compound action potential (ECAP) threshold.
  • Auditory nerve excitability, IHC-SGN synapse counts, SGN density and area, and hair cell quantity were assessed.

Main Results:

  • Electrical stimulation at or above ECAP threshold reduced auditory nerve excitability.
  • Higher intensity electrical stimulation led to a decrease in the number of synapses between IHCs and SGNs.
  • No significant changes were observed in SGN packing density, perikaryal area, or the number of hair cells.

Conclusions:

  • Acute electrical stimulation via CIs can negatively affect auditory nerve function and IHC synaptic integrity.
  • These findings highlight potential risks for CI recipients with residual hearing and warrant further investigation into chronic stimulation effects.
  • Understanding these mechanisms is critical for optimizing CI use and managing hearing loss in neurostimulation patients.