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Titolo:
Evidence for efferent effects on early components of the human auditory brain-stem evoked potentials
Autore:
Polyakov, A; Pratt, H; Shi, YB;
Indirizzi:
Technion Israel Inst Technol, Evoked Potentials Lab, IL-32000 Haifa, Israel Technion Israel Inst Technol Haifa Israel IL-32000 L-32000 Haifa, Israel PLA Gen Hosp, Inst Otolaryngol, Beijing, Peoples R China PLA Gen Hosp Beijing Peoples R China laryngol, Beijing, Peoples R China
Titolo Testata:
EVOKED POTENTIALS-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
fascicolo: 6, volume: 108, anno: 1998,
pagine: 543 - 553
SICI:
0168-5597(199811)108:6<543:EFEEOE>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
COCHLEAR MICROMECHANICAL PROPERTIES; BINAURAL INTERACTION; RESPONSES ABRS; OTOACOUSTIC EMISSIONS; ACOUSTIC STIMULATION; INTERAURAL TIME; MIDDLE-LATENCY; TRAPEZOID BODY; GUINEA-PIGS; WAVE-II;
Keywords:
auditory brain-stem evoked potential; three-channel Lissajous' trajectory; binaural difference component; efferent suppression;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Pratt, H Technion0Israel Inst Technol, Evoked Potentials Lab, Gutwirth Bldg, IL-3200 Technion Israel Inst Technol Gutwirth Bldg Haifa Israel IL-32000
Citazione:
A. Polyakov et al., "Evidence for efferent effects on early components of the human auditory brain-stem evoked potentials", EVOKED POT, 108(6), 1998, pp. 543-553

Abstract

Objectives and methods: Auditory brain-stem evoked potentials (ABEPs) wererecorded from 10 normal hearing subjects in response to rarefaction clicks, presented at a rate of 11/s. Stimuli were binaurally symmetrical and isochronic at 75 dB peSPL or with interaural time disparities (ITDs) of +/-0.4 ms, or intensity disparities (IIDs) of +/-10 dB. Potentials were recorded from vertex-neck, as well as from 3 orthonormally positioned differential derivations. The amplified potentials were averaged over 8000 repetitions using a dwell time of 20 mu s/address/channel. The effects of contralateral stimulation on neural responses of the peripheral auditory system were obtained by subtracting the binaural response from the algebraic sum of responsesto left and right monaural stimuli. From the 3 orthonormal derivations, 3-channel Lissajous' trajectories (3-CLTs) to the various stimulus conditionsand difference waveforms were derived. Results: The results corroborated earlier studies on binaural interaction components (BICs), which include 3 major components corresponding in latency to the vertex-mastoid peaks IV-VI of ABEP. In addition, the binaural difference waveforms included 3 earlier, low-amplitude components. Latency correspondence and comparison of difference waveform and ABEP 3-CLTs indicated that the first and third early difference waveform components corresponded to the negative peaks following I and Iii, respectively, of the vertex-neckABEP to binaural clicks. Conclusions: These results indicate that early ABEP peaks, generated peripheral to binaural convergence, may be affected by contralateral stimulation. These contralateral effects were in a pattern compatible with suppression. most probably by efferents of the olivocochlear bundle. (C) 1998 ElsevierScience Ireland Ltd. All rights reserved.

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Documento generato il 25/01/20 alle ore 09:35:27