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Titolo:
Forward- and simultaneous-masked thresholds in bandlimited maskers in subjects with normal hearing and cochlear hearing loss
Autore:
Dubno, JR; Ahlstrom, JB;
Indirizzi:
Med Univ S Carolina, Dept Otolaryngol Head & Neck Surg, Charleston, SC 29425 USA Med Univ S Carolina Charleston SC USA 29425 urg, Charleston, SC 29425 USA
Titolo Testata:
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
fascicolo: 2, volume: 110, anno: 2001,
pagine: 1049 - 1057
SICI:
0001-4966(200108)110:2<1049:FASTIB>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY-NERVE FIBERS; NARROW-BAND NOISE; FREQUENCY-SELECTIVITY; TEMPORAL INTEGRATION; 2-TONE SUPPRESSION; MASKING; OVERSHOOT; INHIBITION; BANDWIDTH; ASPIRIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Engineering, Computing & Technology
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Dubno, JR Med Univ S Carolina, Dept Otolaryngol Head & Neck Surg, 39 SabinSt,POB 250150, Charleston, SC 29425 USA Med Univ S Carolina 39 Sabin St,POB 250150 Charleston SC USA 29425
Citazione:
J.R. Dubno e J.B. Ahlstrom, "Forward- and simultaneous-masked thresholds in bandlimited maskers in subjects with normal hearing and cochlear hearing loss", J ACOUST SO, 110(2), 2001, pp. 1049-1057

Abstract

Forward- and simultaneous-masked thresholds were measured at 0.5 and 2.0 kHz in bandpass maskers as a function of masker bandwidth and in a broadbandmasker with the goal of estimating psychophysical suppression. Suppressionwas operationally defined in two ways: (1) as a change in forward-masked threshold as a function of masker bandwidth, and (2) as a change in effective masker level with increased masker bandwidth, taking into account the nonlinear growth of forward masking. Subjects were younger adults with normal hearing and older adults with cochlear hearing loss. Thresholds decreased as a function of masker bandwidth in forward masking, which was attributed to effects of suppression; thresholds remained constant or increased slightly with increasing masker bandwidth in simultaneous masking. For subjects with normal hearing, slightly larger estimates of suppression were obtained at 2.0 kHz rather than at 0.5 kHz. For hearing- impaired subjects, suppression was reduced in regions of hearing loss. The magnitude of suppression wasstrongly correlated with the absolute threshold at the signal frequency, but did not vary with thresholds at frequencies remote from the signal. The results suggest that measuring forward-masked thresholds in bandlimited andbroadband maskers may be an efficient psychophysical method for estimatingsuppression. (C) 2001 Acoustical Society of America.

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Documento generato il 29/11/20 alle ore 00:49:30