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Noise-induced hearing loss from non-Gaussian equal energy exposures.

Authors
Davis-RI; Qiu-W; Hamernik-RP
Source
J Acoust Soc Am 2006 Nov; 120(5)(Part 2):3128-3129
NIOSHTIC No.
20034175
Abstract
Data from several different exposures showed that, for equivalent energy [Leq =100 dB9A)] and spectra, exposure to a continuous, non-Gaussian (nonG) noise produces greater hearing and sensory cell loss in the chinchilla than a Gaussian (G)noise. The statistical metric, kurtosis, could order the extent of the trauma. We extend these results to Leq=90 and 110 dB(A), non-Gaussian noises generated using broadband noise bursts, and bandlimited impacts within a continuous G background noise. Data from nine new experimental groups with 11 or 12 chinchillas/group will be presented. Evoked response audiometry established hearing thresholds and surface preparation histology quantified sensory cell loss. There were clear intensity-related effects. At the lowest levels there were no differences in the trauma produced by G and nonG exposures. At Leq=90 dB(A) nonG exposures produced increased trauma relative to equivalent G exposures. By removing energy from the impulsive transients by limiting their bandwidth, trauma could be reduced. The use of noise bursts to produce the nonG noise also reduced the amount of trauma. A metric based on kurtosis and energy may be useful in modifying existing exposure criteria.
Keywords
Noise-exposure; Noise-induced-hearing-loss; Hearing-loss; Hearing-impairment; Animal-studies; Laboratory-animals; Exposure-assessment; Exposure-levels
Contact
Wei Qiu, PhD, Auditory Research Laboratory, State University of New York at Plattsburgh, 101 Broad Street, Plattsburgh, New York, 12901
CODEN
JASMAN
Publication Date
20061101
Document Type
Abstract; Conference/Symposia Proceedings
Email Address
qiuw@plattsburgh.edu
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-008175; Grant-Number-R01-OH-007801
Issue of Publication
5
ISSN
0001-4966
Priority Area
Disease and Injury: Hearing Loss
Source Name
Journal of the Acoustical Society of America
State
NY
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