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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
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; Grant-Number-R01-OH-002317
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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