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Titolo:
A new procedure for measuring peripheral compression in normal-hearing andhearing-impaired listeners
Autore:
Nelson, DA; Schroder, AC; Wojtczak, M;
Indirizzi:
Univ Minnesota, Dept Otolaryngol, Clin Psychoacoust Lab, Minneapolis, MN 55455 USA Univ Minnesota Minneapolis MN USA 55455 st Lab, Minneapolis, MN 55455 USA
Titolo Testata:
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
fascicolo: 4, volume: 110, anno: 2001,
pagine: 2045 - 2064
SICI:
0001-4966(200110)110:4<2045:ANPFMP>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASILAR-MEMBRANE NONLINEARITY; RATE-INTENSITY FUNCTIONS; AUDITORY-NERVE FIBERS; FREQUENCY-SELECTIVITY; 2-TONE SUPPRESSION; CHINCHILLA COCHLEA; RESPONSE GROWTH; MASKING; THRESHOLD; CONSEQUENCES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Engineering, Computing & Technology
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Nelson, DA Univ Minnesota, Dept Otolaryngol, Clin Psychoacoust Lab, MMC 396,420 Delaware St SE, Minneapolis, MN 55455 USA Univ Minnesota MMC 396,420 Delaware St SE Minneapolis MN USA 55455
Citazione:
D.A. Nelson et al., "A new procedure for measuring peripheral compression in normal-hearing andhearing-impaired listeners", J ACOUST SO, 110(4), 2001, pp. 2045-2064

Abstract

Forward-masking growth functions for on-frequency (6-kHz) and off-frequency (3-kHz) sinusoidal maskers were measured in quiet and in a high-pass noise just above the 6-kHz probe frequency. The data show that estimates of response-growth rates obtained from those functions in quiet, which have been used to infer cochlear compression, are strongly dependent on the spread ofprobe excitation toward higher frequency regions. Therefore, an alternative procedure for measuring response-growth rates was proposed, one that employs a fixed low-level probe and avoids level-dependent spread of probe excitation. Fixed-probe-level temporal masking curves (TMCs) were obtained fromnormal-hearing listeners at a test frequency of 1 kHz, where the short 1-kHz probe was fixed in level at about 10 dB SL. The level of the preceding forward masker was adjusted to obtain masked threshold as a function of the time delay between masker and probe. The TMCs were obtained for an on-frequency masker (I kHz) and for other maskers with frequencies both below and above the probe frequency. From these measurements, input/output response-growth curves were derived for individual ears. Response-growth slopes variedfrom > 1.0, at low masker levels to <0.2 at mid masker levels. In three subjects, response growth increased again at high masker levels (> 80 dB SPL). For the fixed-level probe, the TMC slopes changed very little in the presence of a high-pass noise masking upward spread of probe excitation. A greater effect on the TMCs was observed when a high-frequency cueing tone was used with the masking tone. In both cases, however, the net effects on the estimated rate of response growth were minimal. (C) 2001 Acoustical Society of America.

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Documento generato il 04/12/20 alle ore 13:05:42