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The kurtosis metric as an adjunct to energy in the prediction of trauma from continuous, nonGaussian noise exposures.

Authors
Qiu-W; Hamernik-RP; Davis-B
Source
J Acoust Soc Am 2006 Dec; 120(6):3901-3906
NIOSHTIC No.
20031607
Abstract
Data from an earlier study [Hamernik et al. (2003). J. Acoust. Soc. Am. 114, 386-395] were consistent in showing that, for equivalent energy [Leq= 100 dB(A)] and spectra, exposure to a continuous, nonGaussian (nonG) noise could produce substantially greater hearing and sensory cell loss in the chinchilla model than a Gaussian (G) noise exposure and that the statistical metric, kurtosis, computed on the amplitude distribution of the noise could order the extent of the trauma. This paper extends these results to Leq= 90 and 110 dB(A), and to nonG noises that are generated using broadband noise bursts, and band limited impacts within a continuous G background noise. Data from nine new experimental groups with 11 or 12 chinchillas/group is presented. Evoked response audiometry established hearing thresholds and surface preparation histology quantified sensory cell loss. At the lowest level [Leq=90 dB(A)] there were no differences in the trauma produced by G and nonG exposures. For Leq >90 dB(A) nonG exposures produced increased trauma relative to equivalent G exposures. Removing energy from the impacts by limiting their bandwidth reduced trauma. The use of noise bursts to produce the nonG noise instead of impacts also reduced the amount of trauma.
Keywords
Noise-induced-hearing-loss; Animal-studies; Cell-damage; Noise-exposure; Ear-disorders; Impulse-noise; Hearing-loss; Laboratory-animals
Contact
Auditory Research Laboratory, State University of New York, 107 Beaumont Hall, Plattsburgh, New York 12901
CODEN
JASMAN
Publication Date
20061201
Document Type
Journal Article
Email Address
wei.qiu@plattsburgh.edu
Funding Amount
2829511
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02317
Issue of Publication
6
ISSN
3901-3906
Source Name
Journal of the Acoustical Society of America
State
NY
Performing Organization
Communicative Disorders & Scis Research Foundation of Suny P O Box 9 Albany, N Y 12201
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