PMID: 9557979Apr 29, 1998Paper

Effects of noise on inferior colliculus evoked potentials and cochlear anatomy in young and aged chinchillas

Hearing Research
S L McFaddenN Quaranta

Abstract

Like many aging humans, the aging chinchilla tends to lose high-frequency sensitivity at a faster rate than low-frequency sensitivity. This feature, combined with its excellent low-frequency hearing, makes the chinchilla attractive as an animal model for studying the relationship between noise-induced hearing loss (NIHL) and age-related hearing loss (AHL). In the present study, we examined susceptibility to noise in 15 aged (10-15 years old) and 15 young chinchillas. Two levels of noise were used, with the aim of determining whether age-related differences exist in the magnitude and rate of recovery from temporary threshold shifts produced by a moderate-level (95 dB) noise exposure, or in susceptibility to permanent threshold shifts and cochlear damage caused by a high-level (106 dB) noise exposure. Thresholds and response amplitudes at 0.5, 1, 2, 4, 8 and 16 kHz were determined from evoked potentials recorded from the inferior colliculus. Cochlear histology was performed on animals exposed to high-level noise. The results suggest that older animals are equally vulnerable to moderate-level noise, but may be slightly more vulnerable to high-level noise. For moderate-level exposures, there appears to be a simple additive relation...Continue Reading

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Citations

Jun 15, 2011·Journal of the Association for Research in Otolaryngology : JARO·Ryan J Longenecker, Alexander V Galazyuk
Jul 27, 2001·Hearing Research·A W ScholtzA Schrott-Fischer
Sep 19, 2006·Hearing Research·Dalian DingRichard Salvi
Apr 7, 2005·Hearing Research·Sandra L McFaddenDalian Ding
May 28, 2011·Hearing Research·Pierre CampoCécile Parietti-Winkler
Sep 24, 1999·The Journal of the Acoustical Society of America·S L McFadden, P Campo

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