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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

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...
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...
Auditory Perception01:17

Auditory Perception

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 cochlea, a...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
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.
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.

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Related Experiment Video

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Optogenetic Stimulation of the Auditory Nerve
10:53

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Green laser light activates the inner ear.

Gentiana I Wenzel1, Sven Balster, Kaiyin Zhang

  • 1Medical University Hannover, Department of Otolaryngology, Carl-Neuberg-Strasse 1, Hannover, 30625, Germany. Wenzel.Gentiana@mh-hannover.de

Journal of Biomedical Optics
|September 4, 2009
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated that visible light can activate the cochlea, potentially improving hearing restoration. This novel optoacoustic stimulation shows promise for future hearing device development.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Conventional hearing aids and cochlear implants struggle in noisy environments and with complex sounds like music.
  • Current devices have limitations in localized sensorineural activation across cochlear frequency regions.

Purpose of the Study:

  • To assess if visible light, specifically 532 nm with 10-ns pulses, can induce an optoacoustic effect and activate the cochlea.
  • To evaluate the safety and reliability of light-based cochlear activation.

Main Methods:

  • Auditory brainstem responses (ABRs) were recorded in anesthetized guinea pigs to confirm normal hearing.
  • An optical fiber was positioned at the cochlea's round window niche.
  • Optically induced ABRs (OABRs) were elicited using single pulses of visible light.

Main Results:

  • Optically induced ABRs (OABRs) were successfully elicited, showing similar waveforms to acoustic stimulation.
  • OABR amplitude increased with light energy levels (0.6 to 23 microJ/pulse).
  • Consistent OABR responses were observed even after 30 minutes of continuous stimulation, indicating minimal damage.

Conclusions:

  • Visible light can effectively and reliably activate the cochlea via an optoacoustic effect.
  • This light-based stimulation appears safe for cochlear tissue.
  • Further research is needed to explore frequency-specific activation and the underlying mechanisms.