Decision strategies of hearing-impaired listeners in spectral shape discrimination

The Journal of the Acoustical Society of America
Jennifer J Lentz, Marjorie R Leek

Abstract

The ability to discriminate between sounds with different spectral shapes was evaluated for normal-hearing and hearing-impaired listeners. Listeners detected a 920-Hz tone added in phase to a single component of a standard consisting of the sum of five tones spaced equally on a logarithmic frequency scale ranging from 200 to 4200 Hz. An overall level randomization of 10 dB was either present or absent. In one subset of conditions, the no-perturbation conditions, the standard stimulus was the sum of equal-amplitude tones. In the perturbation conditions, the amplitudes of the components within a stimulus were randomly altered on every presentation. For both perturbation and no-perturbation conditions, thresholds for the detection of the 920-Hz tone were measured to compare sensitivity to changes in spectral shape between normal-hearing and hearing-impaired listeners. To assess whether hearing-impaired listeners relied on different regions of the spectrum to discriminate between sounds, spectral weights were estimated from the perturbed standards by correlating the listener's responses with the level differences per component across two intervals of a two-alternative forced-choice task. Results showed that hearing-impaired and nor...Continue Reading

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Citations

Aug 26, 2009·Journal of the Association for Research in Otolaryngology : JARO·Amanda M LauerMarjorie R Leek
Oct 28, 2008·Journal of Speech, Language, and Hearing Research : JSLHR·Joshua M Alexander, Keith R Kluender
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