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Titolo:
Middle ear influence on otoacoustic emissions. I: Noninvasive investigation of the human transmission apparatus and comparison with model results
Autore:
Avan, P; Buki, B; Maat, B; Dordain, M; Wit, HP;
Indirizzi:
Univ Auvergne, Fac Med, Lab Biophys Sensorielle EA 2667, Clermont Ferrand,France Univ Auvergne Clermont Ferrand France EA 2667, Clermont Ferrand,France Semmelweis Univ Med, ENT Dept, H-1085 Budapest, Hungary Semmelweis Univ Med Budapest Hungary H-1085 pt, H-1085 Budapest, Hungary AZG, ENT & Audiol Dept, Groningen, Netherlands AZG Groningen Netherlands ZG, ENT & Audiol Dept, Groningen, Netherlands
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 140, anno: 2000,
pagine: 189 - 201
SICI:
0378-5955(200002)140:1-2<189:MEIOOE>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTRALATERAL ACOUSTIC STIMULATION; DISTORTION PRODUCTS; PRESSURE CHANGES; REFLEX; IMPEDANCE; ORIGIN;
Keywords:
otoacoustic emission; distortion; middle ear impedance; stapedius reflex; middle ear pressure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Avan, P Sch Med, Biophys Lab, POB 38, F-63001 Clermont Ferrand, France SchMed POB 38 Clermont Ferrand France F-63001 nt Ferrand, France
Citazione:
P. Avan et al., "Middle ear influence on otoacoustic emissions. I: Noninvasive investigation of the human transmission apparatus and comparison with model results", HEARING RES, 140(1-2), 2000, pp. 189-201

Abstract

Evoked otoacoustic emissions (EOAEs) are generated within the cochlea in response to external sounds, and they can be acoustically detected in the external auditory meatus after backward propagation through the middle ear. In addition to being used to probe the cochlear mechanisms, they are expected to be sensitive to minute changes in middle ear impedance. Systematic measurements of the changes in the vectorial components of EOAEs were carried out after various manipulations of the human middle ear in order to characterize the influence of stiffness and inertia of the stapes and tympanic-membrane systems. For this purpose, stapedius muscle contractions were elicited by high-level contralateral sound, controlled changes in middle ear pressure (range +/- 100 daPa) were produced and the tympanic membrane was loadedwith water droplets. A computer model of the middle ear network was implemented using a standard lumped-element electric: analog of the middle ear (Zwislocki's model). Forward and backward transmission changes were simulatedand model predictions were compared to experimental data. Apart from the case of positive middle ear pressures. a close qualitative correspondence was found between model and real-ear results. Each of the effects was characterized by a unique pattern of phase and magnitude changes as a function of frequency, in relation to the mechanical characteristics of the involved subsystem (i.e. stapes stiffness, tympanic-membrane stiffness or mass) and its resonance properties. Owing to their high sensitivity; EOAEs could be helpful for an accurate-individual multifrequency analysis of middle ear impedance by comparisons under rest and lest conditions. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 07:10:55