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Titolo:
TEMPORAL PATTERNS OF TRANSIENT-EVOKED OTOACOUSTIC EMISSIONS IN NORMALAND IMPAIRED COCHLEAE
Autore:
AVAN P; BONFILS P; LOTH D; WIT HP;
Indirizzi:
FAC MED CLERMONT FERRAND,DEPT BIOPHYS,BP 38 F-63001 CLERMONT FERRAND FRANCE HOP BOUCICAULT,DEPT EAR NOSE & THROAT F-75730 PARIS 15 FRANCE HOP LARIBOISIERE,DEPT BIOPHYS F-75475 PARIS 10 FRANCE UNIV HOSP GRONINGEN,INST AUDIOL GRONINGEN NETHERLANDS
Titolo Testata:
Hearing research
fascicolo: 1, volume: 70, anno: 1993,
pagine: 109 - 120
SICI:
0378-5955(1993)70:1<109:TPOTOE>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
STIMULATED ACOUSTIC EMISSIONS; HUMAN EAR; MODEL; HEARING;
Keywords:
HUMAN COCHLEA; OTOACOUSTIC EMISSIONS; ACOUSTIC TRAUMA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
P. Avan et al., "TEMPORAL PATTERNS OF TRANSIENT-EVOKED OTOACOUSTIC EMISSIONS IN NORMALAND IMPAIRED COCHLEAE", Hearing research, 70(1), 1993, pp. 109-120

Abstract

The spatial distribution of outer hair cells that participate in generating transient-EOE frequency-components has been investigated in man. According to several models (e.g. Wilson (1990) Hear. Res. 2, 527-532; Zwicker (1986) J. Acoust. Soc. Am. 80, 154-162; Wilson and Kemp (Eds.), Cochlear Mechanisms, Structures, Functions and Models, Plenum Press, NY), EOEs result from interferences between broadly distributed contributions, responsible for their long frequency-dependent delay. This work presents an analysis of the temporal patterns of click- and tone-burst-EOEs in human ears when contributions to EOEs are reduced by noise-induced lesions with audiometric notches centred around 4 kHz (N = 46). Although the auditory thresholds at the frequencies of the studied EOE-components were always normal, these components exhibited drastic and predictable changes compared to normal control ears (N = 40). (1) Their temporal pattern at the highest EOE frequency f(max) just below the audiometric notch appeared to be determined by the cochlear state at high frequencies (6 to 8 kHz). Either it was normal and the EOEexhibited a complicated beat-structure, or it was impaired and the time envelope of the EOE was simple. In contrast, any type of time pattern could be observed in normal ears. (2) The temporal patterns of EOEsone octave below f(max). always presented many beats and short delays. The proposed interpretation is that contributions to a transient-EOEcomponent at frequency f can come from distant basal cochlear areas, i.e. more than 1 and sometimes 1.5 octaves from the place tuned to f. Therefore, the possible relationships between transient-EOEs and tuning mechanisms which presumably involve only a small number of OHC need further investigations.

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Documento generato il 30/11/20 alle ore 10:01:12