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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.

The Auditory Ossicles

The Auditory Ossicles

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...

Anatomy of the Ear

Anatomy of the Ear

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...

The Cochlea

The Cochlea

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.

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...

Auditory Perception

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Hearing loss among classical-orchestra musicians.

Esko Toppila¹, Heli Koskinen, Ilmari Pyykkö

¹Finnish Institute of Occupational Health, Finland. esko.toppila@ttl.fi

|December 22, 2010

Summary

Classical musicians face hearing loss risks, with higher exposure linked to greater damage over 3 kHz. Individual susceptibility factors were low, explaining less hearing deterioration than predicted by ISO 1999-1990 standards.

Area of Science:

Audiology
Occupational Health
Music Performance Science

Background:

Classical musicians are exposed to high sound levels during performances.
Understanding the risk of noise-induced hearing loss (NIHL) in this population is crucial.
Previous predictions (ISO 1999-1990) may not fully account for individual factors.

Purpose of the Study:

To evaluate the risk of hearing loss in classical musicians.
To compare measured hearing loss with ISO 1999-1990 predictions.
To investigate the role of sound exposure and individual susceptibility factors.

Main Methods:

Audiometric testing of 63 musicians from Helsinki classical orchestras.
Questionnaires to assess prior sound exposure and individual susceptibility.

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Dosimetry to measure current sound exposure levels.

Blood pressure and cholesterol level measurements.

Main Results:

Musicians' hearing loss distribution was similar to the general population.
Highly exposed musicians showed greater hearing loss above 3 kHz.
Individual susceptibility factors were minimal.
Actual hearing deterioration was less than ISO 1999-1990 predictions, attributed to low susceptibility.

Conclusions:

Classical music performance can cause hearing deterioration, but less than predicted by ISO 1999-1990.
Low individual susceptibility factors mitigate hearing loss but not tinnitus prevalence.
Further research into tinnitus etiology in musicians is warranted.