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Titolo:
DPOAE MODIFICATIONS INDUCED BY PURE-TONE OVERSTIMULATION IN GUINEA-PIGS
Autore:
CIANFRONE G; INGROSSO A; ALTISSIMI G; RALLI G; TURCHETTA R;
Indirizzi:
UNIV ROMA LA SAPIENZA,ENT INST,CHAIR AUDIOL,VIALE UNIV I-00161 ROME ITALY UNIV ROMA LA SAPIENZA,ENT INST 2 I-00161 ROME ITALY
Titolo Testata:
Scandinavian audiology
, volume: 27, anno: 1998, supplemento:, 48
pagine: 37 - 43
SICI:
0105-0397(1998)27:<37:DMIBPO>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPONTANEOUS OTOACOUSTIC EMISSIONS; ACOUSTIC-DISTORTION PRODUCTS; NOISE EXPOSURE; EAR; SUPPRESSION;
Keywords:
DISTORTION PRODUCT; OTOACOUSTIC EMISSION; COCHLEAR VULNERABILITY; NOISE EXPOSITION; GUINEA PIG;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
G. Cianfrone et al., "DPOAE MODIFICATIONS INDUCED BY PURE-TONE OVERSTIMULATION IN GUINEA-PIGS", Scandinavian audiology, 27, 1998, pp. 37-43

Abstract

Distortion Product Otoacoustic Emissions (DPOAEs) shows a vulnerability to acoustic overstimulation that is easily detectable by changes inamplitude, frequency distribution and time course. The frequency-specific changes in DPOAE provide more information than the more general changes in click evoked otoacoustic emissions. In this work five anaesthetized guinea pigs were examined for changes DPOAE after exposure to pure tones. The noise was a 110 dB SPL pure tones for 45 minutes and the fatiguing tone centered on the geometric mean (GM) of primaries or 2/3 of GM. The most measurable effects were obtained in the latter conditions. The main DP level reduction lasts about one hour after exposure, but the complete recovery is observable only after 24 hours. The frequency distribution of fatiguing effects on the DP-audiogram shows aremarkable fine tuning and a pattern like a low-pass filter. After four hours, in one guinea pig, it is observable an enhancement of the DPamplitude, compared to the pre-exposure level; in another guinea pig,a second overstimulation produced a-more extensive and time-lasting effects than the first exposure.

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Documento generato il 28/11/20 alle ore 11:59:45