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Titolo:
Influence of contralateral acoustic stimulation on distortion-product and spontaneous otoacoustic emissions in the barn owl
Autore:
Manley, GA; Taschenberger, G; Oeckinghaus, H;
Indirizzi:
Tech Univ Munich, Inst Zool, D-85747 Garching, Germany Tech Univ Munich Garching Germany D-85747 ool, D-85747 Garching, Germany
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 138, anno: 1999,
pagine: 1 - 12
SICI:
0378-5955(199912)138:1-2<1:IOCASO>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
COCHLEAR HAIR-CELLS; OLIVOCOCHLEAR BUNDLE STIMULATION; EFFERENT VESTIBULAR SYSTEM; AUDITORY-NERVE; SOUND STIMULATION; BASILAR PAPILLA; GUINEA-PIG; ELECTRICAL-STIMULATION; AFFERENT ACTIVITY; CHICKS COCHLEA;
Keywords:
DPOAE; otoacoustic emission; contralateral acoustic stimulation; barn owl; bird; efferent system;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Manley, GA Tech Univ Munich, Inst Zool, Lichtenbergstr 4, D-85747 Garching, Germany Tech Univ Munich Lichtenbergstr 4 Garching Germany D-85747 any
Citazione:
G.A. Manley et al., "Influence of contralateral acoustic stimulation on distortion-product and spontaneous otoacoustic emissions in the barn owl", HEARING RES, 138(1-2), 1999, pp. 1-12

Abstract

The avian auditory papilla provides an interesting object on which to study efferent influences, because whereas a significant population of hair cells in birds is not afferently innervated, all hair cells are efferently innervated (Fischer, 1992, 1994a, b). Previous studies in mammals using contralateral sound to stimulate the efferent system demonstrated a general suppressive effect on spontaneous and click-evoked, as well as on distortion-product otoacoustic emissions (DPOAE). As little is known about the effects ofcontralateral stimulation on hearing in birds, we studied the effect of such stimuli (broadband noise, pure tones) on the amplitude of the DPOAE 2f(1)-f(2) and on spontaneous otoacoustic emissions (SOAE) in the barn owl, Tyro alba. For the DPOAE measurements, fixed primary-tone pairs [f(1) = 8.875 kHz (ratio = 1.2), f(1) = 8.353 kHz (ratio = 1.15) and f(1) = 7.889 kHz (ratio = 1.1)] were presented and the DPOAE measured in the presence and absence of continuous contralateral stimulation. The DPOAE often declined in amplitude but in some cases we observed DPOAE enhancement. The changes in amplitude were as large as 9 dB. The influence of the contralateral noise changed over time, however, and the effects of contralateral tones were frequency-dependent. SOAE were suppressed in amplitude and shifted in frequency by contralateral broadband noise. Control measurements in animals after middle-ear muscle resection showed that these phenomena were not attributable to the acoustic middle-ear reflex. The finding of DPOAE enhancement is interesting, because a type of efferent fiber that suppressed its discharge rate during stimulation has been described in birds (Kaiser and Manley, 1994). (C) 1999 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 22/10/20 alle ore 03:09:18