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Impact noise exposure in chinchilla: Effects of frequency, level, and interstimulus interval.

Authors
Davis-RR; Murphy-WJ
Source
J Acoust Soc Am 1996 Apr; 99(4):2583
NIOSHTIC No.
20045246
Abstract
The effect of impact noise on hearing threshold was investigated in a parametric study which manipulated frequency, level, and interstimulus interval (ISI). The chinchilla pinna passively amplifies acoustic stimuli between 2 and 6 kHz suggesting greater effects in that frequency range. Exponentially decaying pulses (t = 40 ms) with carrier frequencies of 1, 3, and 8 kHz were presented at peak pressure levels of 114, 117, 120, and 129 dB SPL and ISI of 1, 10, and 100 s. The chinchillas were exposed for 8 h, with one animal per condition. Hearing function was assessed by measuring auditory-evoked potentials from tonebursts at 0.5, 1, 2, 4, and 8 kHz from implanted electrodes. The data indicate a small (<10 dB) permanent threshold shift (PTS) in the 10- and 100-s ISI conditions. For the 1-s ISI conditions, the animals exposed at 129 dB experienced more than 25 dB PTS at high frequencies. Animals exposed at 120 dB exhibited large temporary threshold shifts (TTS) while the animals exposed at lower levels had smaller TTS and minimal PTS. Stimulus level and ISI had significant effects on the PTS while frequency content was not significant.
Keywords
Hearing-level; Hearing-loss; Hearing-acuity; Health-surveys; Age-factors; Age-groups; Information-retrieval-systems; Physical-examination; Racial-factors; Sex-factors; Audiological-testing; Audiometry
Contact
Rickie R. Davis, Bioacoustics and Occupational Vibration Section, NIOSH, MS C-27, 4676 Columbia Pkwy., Cincinnati, OH 45226-1998
CODEN
JASMAN
Publication Date
19960401
Document Type
Abstract
Fiscal Year
1996
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0001-4966
NIOSH Division
DBBS
Source Name
Journal of the Acoustical Society of America
State
OH
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