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Related Concept Videos

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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Personal Protective Equipment01:20

Personal Protective Equipment

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Personal protective equipment (PPE) is unique clothing or equipment worn by an employee to minimize or prevent exposure to infectious agents. PPE creates a barrier between the employee and the infectious materials. PPE must be readily available in the patient care area. PPE includes gloves, gowns and aprons, masks and respirators, goggles, face shields, shoes, and headcovers:
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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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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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Sound Waves: Interference00:53

Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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PPE Use in Healthcare Settings I: Donning01:22

PPE Use in Healthcare Settings I: Donning

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Donning PPE must be completed before contact with the patient. This process protects from infectious agents. The sequence and action included in each donning are critical, and the steps must be systematic to avoid exposure to pathogens. The institutional policy also needs to be followed while donning PPE. The pre-donning preparations are gathering equipment, inspecting the PPE equipment for tears, holes, or damage, removing jewelry, removing any garments below the elbows, and tying the hair...
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Related Experiment Video

Updated: Jan 8, 2026

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

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Hearing aids and hearing protection.

Petra Svačinová, Vendula Guldánová, Barbora Vraníková

    Ceska a Slovenska Farmacie : Casopis Ceske Farmaceuticke Spolecnosti a Slovenske Farmaceuticke Spolecnosti
    |December 18, 2025
    PubMed
    Summary

    Hearing aids can improve communication for individuals with hearing loss. This article reviews hearing aid types, features, and maintenance, alongside hearing protection devices to prevent noise-induced hearing damage.

    Keywords:
    medical devicesbehind the ear hearing aidsearplugshearing aidshearing protectionin the ear hearing aids

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    Area of Science:

    • Audiology
    • Otolaryngology
    • Public Health

    Background:

    • Hearing loss significantly impacts quality of life across all age groups.
    • Excessive noise exposure is a primary cause of preventable hearing damage.
    • Hearing aids and protection are crucial for managing and preventing hearing impairments.

    Purpose of the Study:

    • To present basic types of hearing aids.
    • To provide an overview of hearing aid use, adjustment, and maintenance.
    • To review various hearing protection devices.

    Main Methods:

    • Literature review of hearing aid technologies.
    • Overview of hearing protection device categories.
    • Discussion of hearing aid fitting and care.

    Main Results:

    • Multiple hearing aid types exist, offering varied solutions for hearing loss.
    • Proper adjustment and maintenance are key to hearing aid efficacy.
    • Various hearing protection devices are available for noise reduction.

    Conclusions:

    • Hearing aids can significantly enhance speech comprehension and quality of life.
    • Hearing protection is essential for preventing noise-induced hearing loss.
    • Understanding hearing aid options and protective measures empowers individuals to manage hearing health.