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Sound Intensity Level

Sound Intensity Level

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 hence a...

Hearing

Hearing

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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Perception of Sound Waves

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 frequency...

Sensation

Sensation

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.
Absolute thresholds can quantify the sensitivity of sensory...

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

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 identifying...

Unrenewable Cells

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

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Related Experiment Video

Updated: Jun 5, 2026

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

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

Noise sensitivity and hearing disability.

Marja Heinonen-Guzejev¹, Tapani Jauhiainen, Heikki Vuorinen

¹Department of Public Health, The Hjelt Institute, University of Helsinki, Helsinki, Finland. marja.heinonen@helsinki.fi

|December 22, 2010

Summary

Noise sensitivity is linked to self-reported hearing disability, especially in women and younger individuals. This highlights the importance of considering noise sensitivity in hearing studies.

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Area of Science:

Audiology
Environmental Health
Epidemiology

Background:

Noise sensitivity is a subjective experience influencing individual responses to noise.
Understanding the link between noise sensitivity and objective hearing measures is crucial for public health.

Purpose of the Study:

To investigate the association between noise sensitivity and self-reported hearing disability and hearing levels.
To examine the role of noise exposure history and hearing protector use in this association.

Main Methods:

Utilized data from the Finnish Twin Cohort, including questionnaires on noise sensitivity, hearing disability, noise exposure, and hearing protector use.
Audiometry data was available for a subsample of elderly women.

Main Results:

Noise sensitivity was significantly associated with self-reported hearing disability, particularly in women and younger subjects (≤50 years).
No significant association was found between noise sensitivity and objective hearing thresholds in elderly women.
Noise sensitivity was linked to hearing protector use but did not modify the association between hearing disability and occupational noise exposure.

Conclusions:

Noise sensitivity is an important factor to consider in noise effect studies, impacting annoyance and potentially other health outcomes.
Recognizing noise sensitivity is vital for accurate interpretation of hearing-related research and interventions.