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Titolo:
Basics of hearing theory and noise in cochlear implants
Autore:
Rattay, F;
Indirizzi:
Vienna Univ Technol, TU Biomed, A-1040 Vienna, Austria Vienna Univ Technol Vienna Austria A-1040 Biomed, A-1040 Vienna, Austria
Titolo Testata:
CHAOS SOLITONS & FRACTALS
fascicolo: 12, volume: 11, anno: 2000,
pagine: 1875 - 1884
SICI:
0960-0779(200009)11:12<1875:BOHTAN>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY-NERVE FIBERS; HAIR CELL; FREQUENCY; PATTERNS; MODEL; REPRESENTATION; SYSTEM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Rattay, F Vienna Univ Technol, TU Biomed, Wiedner Hauptstr 8-10-1145, A-1040 Vienna,Austria Vienna Univ Technol Wiedner Hauptstr 8-10-1145 Vienna Austria A-1040
Citazione:
F. Rattay, "Basics of hearing theory and noise in cochlear implants", CHAOS SOL F, 11(12), 2000, pp. 1875-1884

Abstract

Stochastic behavior in spiking or. the electrically stimulated bipolar afferent cochlear neuron of man and cat is analyzed with a compartment model that includes the first unmyelinated part, every node and internode in the peripheral and central axon, and the soma. Following a suggestion of Rubinstein, ion current fluctuations across the neural membrane are assumed to be proportional to the square root of the number of sodium channels in every compartment [Rubinstein JT. Biophys J 1995,68:779-85]. Intracellular conductance and capacitance effects disturb a direct relation between voltage and current fluctuations in a single compartment. Paradoxically, the unmyelinated human soma is the compartment with the highest number of sodium channelsand the smallest voltage noise. Voltage fluctuates with maximum amplitudesin the peripheral axon, followed by the thicker central axon. The model demonstrates that a train of biphasic stimulating pulses can generate a pattern in the cochlear nerve with temporal structures which are fine enough to discriminate speech signals. However, several important differences betweenthe electrically and acoustically generated spiking patterns demand for sophisticated strategies to obtain better speech understanding for cochlear implant users. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 22:46:57