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Auditory System - Clinical and Special Topics (Paperback, Softcover reprint of the original 1st ed. 1976)
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Auditory System - Clinical and Special Topics (Paperback, Softcover reprint of the original 1st ed. 1976)
Series: Handbook of Sensory Physiology, 5 / 3
Expected to ship within 10 - 15 working days
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after heated and often bitter debates, SIEBENMANN'S opinion finally
prevailed, i. e. , a contribution to cochlear lesions due to
vibrations of the floor transmitted via bone conduction could not
be demonstrated. For one thing, it was hard to see how appreciable
amounts of energy could reach the ears in this manner, considering
the attenuation that is bound to occur across each of the many
joints along the pathway involved. In some older audiological
surveys conducted in industry (e. g. , TEMKIN, 1933), groups of
workmen were found who displayed signs of apical-turn lesions, i.
e. , low-tone hearing losses for air and for bone. Such lesions
could not be expected to results from exposure to air-borne sounds
because of the low-frequency attenu ation of the middle ear.
Although WITTMAACK'S explanation, which was frequently invoked in
such reports, does no longer appear tenable, such apical-turn
lesions could conceivably be caused by bone conduction components
of high-intensity noise in the sense of BEKESY (1948). - As far as
I am aware of, no newer studies have been conducted in this problem
area, and the older experiments and/or surveys were done at times
before signal parameters could be precisely controlled or measured.
A detailed, critical review of the older studies on the potential
contribution of bone-conducted energy to industrial hearing loss
and its underlying pathology may be found in Werner (1940) who,
incidently, favored SIEBENMANN'S point of VIew.
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