Related Experiment Video
Updated: May 30, 2025
07:13
Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
Published on: February 10, 2023
2.1K
Not-so-normal hearing: Temporary hearing changes lead to chronic difficulties for listeners with "normal" audiometric
Douglas S Brungart1, Gregory M Ellis1, Alyssa Davidson1
1Walter Reed National Military Medical Center, 4494 N Palmer Road, Bethesda, MD, 20889, USA.
Hearing Research
|January 26, 2025
Summary
Hearing difficulties can occur even with normal hearing thresholds. Noise exposure history significantly impacts hearing difficulty, suggesting individual susceptibility to noise-induced hearing damage.
Area of Science:
- Audiology
- Occupational Health
- Auditory Science
Background:
- Historically, hearing loss is defined by elevated pure-tone thresholds.
- Recent research highlights hearing difficulties in individuals with normal hearing thresholds.
- Understanding factors beyond pure-tone thresholds is crucial for hearing health.
Purpose of the Study:
- To investigate the relationship between hearing thresholds, noise exposure, and self-reported hearing difficulties.
- To examine the prevalence of hearing difficulties within the 'normal' hearing range.
- To assess the impact of noise exposure history on hearing difficulties.
Main Methods:
- A large-scale study involving 10,492 Service Members.
- Measurement of hearing thresholds, noise exposure history, and temporary threshold shift history.
- Assessment of self-reported hearing difficulty.
Main Results:
- Hearing difficulties increase with decreasing hearing thresholds, even within the normal range.
- Noise exposure history is linked to increased hearing difficulty across all thresholds.
- Individuals reporting temporary threshold shifts after noise exposure show greater hearing difficulty.
Conclusions:
- Hearing difficulties are not solely determined by elevated pure-tone thresholds.
- Noise exposure history is a significant predictor of hearing difficulty.
- Individual susceptibility to noise-induced hearing damage may vary, influencing post-noise hearing symptoms.
Related Concept Videos
01:31Hearing
51.8K
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.
51.8K
01:15Auditory Pathway
4.6K
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...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
4.6K
01:21Perceiving Loudness, Pitch, and Location
191
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.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
191
01:13The Cochlea
44.5K
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.
44.5K
01:01Perception of Sound Waves
4.4K
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...
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
4.4K
00:53Sound Intensity Level
4.1K
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.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
4.1K