PMID: 3771928Oct 1, 1986Paper

Hazard from intense low-frequency acoustic impulses

The Journal of the Acoustical Society of America
G R Price

Abstract

It was predicted that because the ear is spectrally tuned, it should be most affected by intense impulses with spectral peaks near the frequency where it is tuned best (3.0 kHz for the human ear) and progressively less affected by impulses at lower frequencies [G.R. Price, Scand. Audiol. Suppl. 16, 111-121 (1982)]. This prediction is counter to all the DRCs for impulse noise; therefore an adequate test is essential. In order to augment the data on hearing loss to low-spectral-frequency impulses, three groups of cats (eight, nine, and ten animals) were exposed on one occasion to 50 impulses from a 105-mm howitzer at peak SPLs of 153, 159, and 166 dB. Threshold shifts were measured electrophysiologically on the day of exposure (CTS) and following a 2-month recovery period (PTS). Maximum PTSs appeared at 4 kHz (even though the spectral peak of the impulse had been at about 100 Hz), and CTSs recovered into PTSs about half as large. Furthermore, for group data, even small CTSs tended to have a permanent component. These data raise the question as to whether or not any threshold shift persisting an hour or two after exposure to high levels should be considered tolerable. When compared with data from rifle fire exposures, the data con...Continue Reading

Citations

Aug 1, 1992·Electroencephalography and Clinical Neurophysiology·S A Counter, E Borg
Jul 11, 2013·PloS One·Sung-Il ChoJohn S Oghalai
Jun 1, 1993·British Journal of Audiology·J PekkarinenI Pyykkö
Sep 19, 2006·Hearing Research·G Richard Price
Jul 2, 2018·The Journal of the Acoustical Society of America·Peter K GottliebSunil Puria
Jan 1, 1988·Audiology : Official Organ of the International Society of Audiology·J GrennerB Katbamna

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