Behavioral and physiological correlates of temporal pitch perception in electric and acoustic hearing.
J Acoust Soc Am
; 123(2): 973-85, 2008 Feb.
Article
em En
| MEDLINE
| ID: mdl-18247900
ABSTRACT
In the "4-6" condition of experiment 1, normal-hearing (NH) listeners compared the pitch of a bandpass-filtered pulse train, whose inter-pulse intervals (IPIs) alternated between 4 and 6 ms, to that of isochronous pulse trains. Consistent with previous results obtained at a lower signal level, the pitch of the 4-6 stimulus corresponded to that of an isochronous pulse train having a period of 5.7 ms-longer than the mean IPI of 5 ms. In other conditions the IPI alternated between 3.5-5.5 and 4.5-6.5 ms. Experiment 2 was similar but presented electric pulse trains to one channel of a cochlear implant. In both cases, as overall IPI increased, the pitch of the alternating-interval stimulus approached that of an isochronous train having a period equal to the mean IPI. Experiment 3 measured compound action potentials (CAPs) to alternating-interval stimuli in guinea pigs and in NH listeners. The CAPs to pulses occurring after 4-ms intervals were smaller than responses to pulses occurring after 6-ms intervals, resulting in a modulated pattern that was independent of overall level. The results are compared to the predictions of a simple model incorporating auditory-nerve (AN) refractoriness, and where pitch is estimated from first-order intervals in the AN response.
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Base de dados:
MEDLINE
Assunto principal:
Discriminação da Altura Tonal
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Psicoacústica
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Estimulação Acústica
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Implantes Cocleares
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Nervo Coclear
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Modelos Neurológicos
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article