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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

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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.
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...
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Sensation01:21

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Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
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Perception of Sound Waves01:01

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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.
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Sound Intensity00:58

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Hearing01:31

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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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Perceiving Loudness, Pitch, and Location01:21

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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.
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...
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Updated: Aug 28, 2025

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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What is Noise Sensitivity?

David Welch1, Kim N Dirks2, Daniel Shepherd3

  • 1Section of Audiology, School of Population Health, University of Auckland, Auckland, New Zealand.

Noise & Health
|September 20, 2022
PubMed
Summary
This summary is machine-generated.

Noise sensitivity measures may underestimate effects on health outcomes. Only loudness discomfort level (LDL) correlated with annoyance, suggesting current methods capture only parts of noise sensitivity.

Keywords:
Annoyanceaircraftloudnessnoise sensitivity

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Area of Science:

  • Environmental Health
  • Psychoacoustics
  • Audiology

Background:

  • Noise sensitivity is a key factor moderating the relationship between environmental noise exposure and adverse health outcomes.
  • Understanding noise sensitivity is crucial for assessing the impact of noise pollution on well-being.

Purpose of the Study:

  • To evaluate different methods for measuring noise sensitivity in adults.
  • To investigate the correlation between noise sensitivity measures and reactions to environmental noise (aeroplane overflight).

Main Methods:

  • Noise sensitivity was assessed using a questionnaire, a self-rating scale, and the loudness discomfort level (LDL).
  • Participants rated annoyance and loudness after exposure to recorded aeroplane overflight sounds (80 dBLAeq).

Main Results:

  • The three noise sensitivity measures showed poor inter-correlation.
  • Only the overall LDL was significantly associated with reported loudness and annoyance from aeroplane sounds.

Conclusions:

  • Current noise sensitivity measures may be insufficient, potentially underestimating noise's impact on health.
  • A theoretical model was developed to better understand the multifactorial nature of noise sensitivity and guide future research.