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The value of a kurtosis metric in estimating the hazard to hearing of complex industrial noise exposures.

Authors
Qiu-W; Hamernik-RP; Davis-RI
Source
J Acoust Soc Am 2013 May; 133(5):2856-2866
NIOSHTIC No.
20043530
Abstract
A series of Gaussian and non-Gaussian equal energy noise exposures were designed with the objective of establishing the extent to which the kurtosis statistic could be used to grade the severity of noise trauma produced by the exposures. Here, 225 chinchillas distributed in 29 groups, with 6 to 8 animals per group, were exposed at 97 dB SPL. The equal energy exposures were presented either continuously for 5 d or on an interrupted schedule for 19 d. The non-Gaussian noises all differed in the level of the kurtosis statistic or in the temporal structure of the noise, where the latter was defined by different peak, interval, and duration histograms of the impact noise transients embedded in the noise signal. Noise-induced trauma was estimated from auditory evoked potential hearing thresholds and surface preparation histology that quantified sensory cell loss. Results indicated that the equal energy hypothesis is a valid unifying principle for estimating the consequences of an exposure if and only if the equivalent energy exposures had the same kurtosis. Furthermore, for the same level of kurtosis the detailed temporal structure of an exposure does not have a strong effect on trauma.
Keywords
Noise-exposure; Acoustics; Acoustic-trauma; Physiopathology; Hearing-loss; Etiology; Exposure-limits; Risk-factors; Risk-analysis; Animals; Laboratory-animals; Environmental-exposure; Monitors; Statistical-analysis; Workers; Auditory-system; Sound; Risk-factors
CODEN
JASMAN
Publication Date
20130501
Document Type
Journal Article
Email Address
wei.qiu@plattsburgh.edu
Funding Type
Grant
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002317; M122013
Issue of Publication
5
ISSN
0001-4966
Source Name
Journal of the Acoustical Society of America
State
NY
Performing Organization
State University of New York at Buffalo, Buffalo, New York
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