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Related Concept Videos

The Vestibular System01:29

The Vestibular System

39.6K
The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
39.6K
Equilibrium and Balance01:15

Equilibrium and Balance

4.7K
The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
4.7K
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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Anatomy of the Ear01:16

Anatomy of the Ear

8.4K
Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
8.4K
Auditory Perception01:17

Auditory Perception

340
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...
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Auditory Pathway01:15

Auditory Pathway

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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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Related Experiment Videos

A Virtual Inner Ear Model Selects Ramped Pulse Shapes for Vestibular Afferent Stimulation.

Joseph Chen1,2, Jayden Sprigg1, Nicholas Castle1

  • 1Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019, USA.

Bioengineering (Basel, Switzerland)
|December 23, 2023
PubMed
Summary
This summary is machine-generated.

Optimizing vestibular prostheses (VPs) involves adjusting stimulation pulse slopes to improve vestibular afferent unit recruitment. This research identified an optimized slope reducing excitation spread and enhancing neural dynamic range for better VOR gain.

Keywords:
bilateral vestibular deficiencyelectrical pulseramped pulsevestibular prosthesis

Related Experiment Videos

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Otolaryngology

Background:

  • Bilateral vestibular deficiency (BVD) causes chronic dizziness and postural instability.
  • Current vestibular prostheses (VPs) have limited success in restoring vestibulo-ocular reflex (VOR) gain.
  • The precise stimulation parameters for VPs require further optimization.

Purpose of the Study:

  • To investigate the impact of stimulation pulse ramp slope on vestibular afferent unit recruitment.
  • To identify an optimized stimulation pulse train for improved VP function.
  • To reduce current spread and expand the neural dynamic range in vestibular prostheses.

Main Methods:

  • Customized programming generated ramped stimulation pulses with varying slopes.
  • Bench tests and simulations evaluated electrically evoked compound action potentials (eCAPs) and current spread.
  • A virtual inner ear model was developed to simulate neural responses.

Main Results:

  • The slope of stimulation pulses significantly influenced vestibular afferent unit recruitment.
  • An optimized pulse slope was identified, improving vestibular afferent activity modulation.
  • The optimized slope reduced excitation spread within semicircular canals and expanded neural dynamic range.

Conclusions:

  • Stimulation pulse ramp slope is a critical factor in vestibular afferent recruitment for VPs.
  • Optimized stimulation parameters show potential for enhancing VP efficacy.
  • Further in vitro and in vivo studies are needed to validate these simulation findings.