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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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Sound Intensity Level00:53

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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The Cochlea01:13

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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

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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...
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The Auditory Ossicles01:11

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Do Modern Hearing Aids Meet ANSI Standards?

Jourdan T Holder1, Erin M Picou1, Jill M Gruenwald1

  • 1Department of Hearing and Speech Sciences, Vanderbilt Bill Wilkerson Center, Vanderbilt University Medical Center, Nashville, TN.

Journal of the American Academy of Audiology
|August 27, 2016
PubMed
Summary

All new hearing aids failed American National Standards Institute (ANSI) specifications, with systematic discrepancies in quality control protocols being the primary issue. This highlights significant challenges for hearing aid dispensers ensuring device functionality before patient use.

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Area of Science:

  • Audiology
  • Medical Devices
  • Quality Control

Background:

  • The American National Standards Institute (ANSI) sets critical standards for hearing aid quality control.
  • Non-compliance with ANSI specifications can negatively impact users, professionals, and the hearing aid industry.
  • Limited research exists on the pre-dispensing compliance rate of new hearing aids with ANSI quality control standards.

Purpose of the Study:

  • To determine the percentage of new hearing aids compliant with the relevant ANSI standard.
  • To identify trends in electroacoustic analysis data for new hearing aids.

Main Methods:

  • Evaluated 73 behind-the-ear hearing aids from four major manufacturers before clinical dispensing.
  • Utilized Audioscan Verifit and Frye's Fonix 8000 test box systems for electroacoustic analysis and directional processing evaluation.
  • Assessed compliance with the ANSI S3.22-2009 standard, focusing on equivalent input noise (EIN) and temporal characteristics.

Main Results:

  • 100% of evaluated hearing aids failed to meet at least one ANSI specification.
  • Equivalent input noise (EIN) and attack/release times were the most common non-compliant measures.
  • Systematic discrepancies accounted for approximately 93% of non-compliance, indicating issues with quality control protocols.

Conclusions:

  • Systematic discrepancies in quality control testing protocols present significant barriers for dispensers in verifying hearing aid function.
  • The high rate of non-compliance underscores the necessity of robust quality control for new and repaired hearing aids.
  • Ensuring proper device function before dispensing is crucial to prevent negative implications for patients and the industry.