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Titolo:
Effects of masker frequency and duration in forward masking: further evidence for the influence of peripheral nonlinearity
Autore:
Oxenham, AJ; Plack, CJ;
Indirizzi:
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Elect Res Lab, Cambridge, MA 02139 USA Univ Essex, Dept Psychol, Colchester CO4 3SQ, Essex, England Univ Essex Colchester Essex England CO4 3SQ ester CO4 3SQ, Essex, England
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 150, anno: 2000,
pagine: 258 - 266
SICI:
0378-5955(200012)150:1-2<258:EOMFAD>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASILAR-MEMBRANE NONLINEARITY; AUDITORY-NERVE FIBERS; TEMPORAL INTEGRATION; QUANTITATIVE MODEL; SIGNAL DELAY; HEARING; LEVEL; LISTENERS; SYSTEM; NOISE;
Keywords:
forward masking; cochlear nonlinearity; temporal processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Oxenham, AJ MIT, Elect Res Lab, Rm 36-763, Cambridge, MA 02139 USA MIT Rm 36-763 Cambridge MA USA 02139 , Cambridge, MA 02139 USA
Citazione:
A.J. Oxenham e C.J. Plack, "Effects of masker frequency and duration in forward masking: further evidence for the influence of peripheral nonlinearity", HEARING RES, 150(1-2), 2000, pp. 258-266

Abstract

Forward masking has often been thought of in terms of neural adaptation, with nonlinearities in the growth and decay of forward masking being accounted for by the nonlinearities inherent in adaptation. In contrast, this study presents further evidence for the hypothesis that forward masking can be described as a linear process, once peripheral, mechanical nonlinearities are taken into account. The first experiment compares the growth of masking for on- and off-frequency maskers. Signal thresholds were measured as a function of masker level for three masker-signal intervals of 0, 10, and 30 ms. The brief 4-kHz sinusoidal signal was masked by a 200-ms sinusoidal forward masker which had a frequency of either 2.4 kHz (off-frequency) or 4 kHz (on-frequency). As in previous studies, for the on-frequency condition, theslope of the function relating signal threshold to masker level became shallower as the delay between the masker and signal was increased. In contrast, the slopes for the off-frequency condition were independent of masker-signal delay and had a value of around unity, indicating linear growth of masking for all masker-signal delays. In the second experiment, a broadband Gaussian noise forward masker was used to mask a brief 6-kHz sinusoidal signal. The spectrum level of the masker was either 0 or 40 dB (re: 20 mu Pa). The gap between the masker and signal was either 0 or 20 ms. Signal thresholds were measured for masker durations from 5 to 200 ms. The effect of masker duration was found to depend more on signal level than on gap duration ormasker level. Overall, the results support the idea that forward masking call be modeled as a linear process, preceded by a static nonlinearity resembling that found on the basilar membrane. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 04/12/20 alle ore 13:29:31