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Titolo:
Acoustically and electrically evoked contralateral suppression of otoacoustic emissions in guinea pigs
Autore:
Popelar, J; Valvoda, J; Syka, J;
Indirizzi:
Acad Sci Czech Republ, Inst Expt Med, Prague 14220 4, Czech Republic Acad Sci Czech Republ Prague Czech Republic 14220 4 20 4, Czech Republic Charles Univ, Fac Med 1, ENT Clin, Prague, Czech Republic Charles Univ Prague Czech Republic 1, ENT Clin, Prague, Czech Republic
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 135, anno: 1999,
pagine: 61 - 70
SICI:
0378-5955(199909)135:1-2<61:AAEECS>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
EFFERENT OLIVOCOCHLEAR NEURONS; AUDITORY-NERVE FIBERS; DISTORTION PRODUCTS; COCHLEAR MECHANICS; ROUND WINDOW; STIMULATION; RESPONSES; EAR; HUMANS; NOISE;
Keywords:
evoked otoacoustic emission; contralateral suppression; acoustic stimulation; electrical stimulation; guinea pig;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Popelar, J Acad Sci Czech Republ, Inst Expt Med, Videnska 1083, Prague 14220 4, CzechRepublic Acad Sci Czech Republ Videnska 1083 Prague Czech Republic 14220 4
Citazione:
J. Popelar et al., "Acoustically and electrically evoked contralateral suppression of otoacoustic emissions in guinea pigs", HEARING RES, 135(1-2), 1999, pp. 61-70

Abstract

It is generally accepted that stimulation of the efferent auditory system results in changes of cochlear activity. A simple method of activating the olivocochlear pathway by contralateral electrical stimulation of the round window (ES-RW) was used in this study with the aim of comparing the efficacy of acoustically and/or electrically evoked contralateral suppression. Thesuppression of transient evoked otoacoustic emissions (TEOAEs) and distortion product otoacoustic emissions (DPOAEs) was elicited by contralateral acoustic stimulation (AS) (61 dB SPL continuous white noise), and/or by electrical stimulation of an electrode implanted at the contralateral round window (monopolar rectangular pulses 0.1 ms, repetition rate 300 Hz, intensity 50-100 mu A) in 12 guinea pigs. The average value of contralateral suppression of TEOAEs amounted to 1.04 +/- 0.48 dB for acoustic stimulation and 0.97 +/- 0.53 dB for round window electrical stimulation. The simultaneous presentation of both acoustic and electrical stimulation had only a slight additive effect and resulted in 1.27+/-0.79 dB diminution of TEOAEs. The suppression of DPOAEs during contralateral acoustic and electrical stimulation was evident mainly at low and middle frequencies (1-4 kHz). In two guinea pigs the maximum DPOAE suppression was present at high frequencies. The average values of contralateral suppression measured at individual f(2) frequencies of DPOAEs were similar to those calculated from 1/4 octave power spectrum analysis of the TEOAEs in half of the animals. The results demonstrated that contralateral ES-RW had a similar suppressive effect on TEOAEs and DPOAEs as did contralateral AS and simultaneous AS+(ES-RW). The results of spectral analysis suggested that both modes of contralateral stimulation excited similar sensory cochlear elements and induce comparable suppression of both TEOAEs and DPOAEs. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 29/11/20 alle ore 00:36:11