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Titolo:
The behavior of evoked otoacoustic emissions during and after postural changes
Autore:
de Kleine, E; Wit, HP; Avan, P; van Dijk, P;
Indirizzi:
Univ Groningen Hosp, Dept Otorhinolaryngol, NL-9700 RB Groningen, Netherlands Univ Groningen Hosp Groningen Netherlands NL-9700 RB ningen, Netherlands Fac Med, Dept Biophys, F-63001 Clermont Ferrand, France Fac Med Clermont Ferrand France F-63001 F-63001 Clermont Ferrand, France Univ Hosp, Dept Otorhinolaryngol & Head & Neck Surg, NL-6202 AZ Maastricht, Netherlands Univ Hosp Maastricht Netherlands NL-6202 AZ 2 AZ Maastricht, Netherlands
Titolo Testata:
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
fascicolo: 2, volume: 110, anno: 2001,
pagine: 973 - 980
SICI:
0001-4966(200108)110:2<973:TBOEOE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
OTO-ACOUSTIC EMISSIONS; MIDDLE-EAR INFLUENCE; INTRACRANIAL-PRESSURE; ENDOLYMPHATIC HYDROPS; COCHLEAR AQUEDUCT; TYMPANIC MEMBRANE; NORWEGIAN CATTLE; TRANSMISSION; IMPEDANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Engineering, Computing & Technology
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: de Kleine, E Univ Groningen Hosp, Dept Otorhinolaryngol, POB 30-001, NL-9700 RB Groningen, Netherlands Univ Groningen Hosp POB 30-001 Groningen Netherlands NL-9700 RB
Citazione:
E. de Kleine et al., "The behavior of evoked otoacoustic emissions during and after postural changes", J ACOUST SO, 110(2), 2001, pp. 973-980

Abstract

Click-evoked and stimulus frequency otoacoustic emissions (CEOAEs and SFOAEs, respectively) were studied in humans during and after postural changes. The subjects were tilted from upright to a recumbent position (head down 30 deg) and upright again. Due to the downward posture change, CEOAEs showeda phase increase (80 deg at 1 kHz) and a level decrease (0.5 at I kHz), especially for frequency components below 2 kHz. For SFOAEs, the typical ripple pattern showed a positive shift along the frequency axis, which can be interpreted as a phase shift of the inner-ear component of the microphone signal (90 deg at I kHz). This also occur-red mainly for frequencies below 2 kHz. The altered posture is thought to cause an increase of the intracranial pressure, and consequently of the intracochlear fluid pressure, which results in an increased stiffness of the stapes system. The observed emission changes are in agreement with predictions from a model in which the stiffness of the cochlear windows was altered. For CEOAEs, the time to regain stability after a downward turn was of the order of 30 s, while this took about20 s after an upward turn. For SFOAEs, this asymmetry was not found to be present (about 11 s, both for up- and downward turns). (C) 2001 Acoustical Society of America.

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Documento generato il 02/12/20 alle ore 13:43:14