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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

3.8K
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Motor Unit Stimulation01:20

Motor Unit Stimulation

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Cochlear size variation in a large-scale international multicentre cohort.

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Related Experiment Video

Updated: Nov 10, 2025

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
03:49

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Published on: October 11, 2024

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EAS-Combined electric and acoustic stimulation.

Anandhan Dhanasingh1, Ingeborg Hochmair1

  • 1MED-EL Elektromedizinische Geraete Gesellschaft m.b.H., Innsbruck, Austria.

Acta Oto-Laryngologica
|April 5, 2021
PubMed
Summary

Electric-acoustic stimulation (EAS) combines cochlear implants for high frequencies with hearing aids for low frequencies. Translational research has advanced EAS technology for better hearing preservation and device integration.

Keywords:
Electric-acoustic stimulationElectro-cochleographyflexible electrodehearing preservationunified audio processor

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Area of Science:

  • Otorhinolaryngology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Electric-acoustic stimulation (EAS) is designed for patients with high-frequency hearing loss and preserved low-frequency hearing.
  • EAS combines electric stimulation via a cochlear implant (CI) in high frequencies with acoustic amplification from a hearing aid (HA) in low frequencies.

Observation:

  • Successful EAS requires preserving residual hearing, necessitating flexible electrode arrays to protect cochlear structures.
  • A unified audio processor integrating CI and HA components is crucial for patient convenience and effective EAS fitting.

Findings:

  • Key translational research by MED-EL focused on developing flexible electrodes, unified audio processors, and improved fitting processes.
  • Innovations include intra-operative monitoring and pre-operative software for cochlear assessment and electrode selection.

Implications:

  • These advancements have facilitated the transition of EAS from concept to widespread clinical application.
  • Continued research in EAS aims to further optimize audiological outcomes and patient benefit.