Sensitivity to changes in overall level and spectral shape: an evaluation of a channel model

The Journal of the Acoustical Society of America
J J Lentz, V M Richards

Abstract

Two experiments involving level and spectral shape discrimination which test an optimal channel model developed by Durlach et al. [J. Acoust. Soc Am. 80, 63-72 (1986)] are described. The model specifies how the auditory system compares and/or combines intensity information in different frequency channels. In the first experiment, psychometric functions were obtained for the discrimination of changes in level and discrimination of changes in spectral shape for an eight-tone complex sound. A variety of different base spectral shapes were tested. In some conditions, level randomization was introduced to reduce the reliability of across-interval changes in level. Increasing the amount of level variation degraded performance for the level discrimination task but had no effect on the shape discrimination task. In all conditions, sensitivity to changes in spectral shape was superior to sensitivity to changes in level. Consequently, two models of central noise are evaluated in an attempt to explain these results; one in which central noise acts prior to the formation of the likelihood ratio and one in which central noise degrades the likelihood ratio. The former model is more successful in accounting for the data. In a second experimen...Continue Reading

References

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Citations

Jan 5, 2002·The Journal of the Acoustical Society of America·W R Drennan, C S Watson
Mar 27, 2003·The Journal of the Acoustical Society of America·Jennifer J Lentz, Marjorie R Leek
Mar 6, 2004·The Journal of the Acoustical Society of America·Bruce G Berg
Nov 26, 1999·The Journal of the Acoustical Society of America·J J LentzM R Matiasek
Jan 18, 2007·The Journal of the Acoustical Society of America·Robert A Lutfi, Walt Jesteadt
Aug 31, 2006·The Journal of the Acoustical Society of America·Jennifer J Lentz
Dec 3, 2008·The Journal of the Acoustical Society of America·Matthew J GoupellWolf-Dieter Baumgartner
Dec 3, 2015·The Journal of the Acoustical Society of America·Yonghee OhEvelyn M Hoglund
Mar 7, 2017·ELife·Yves BoubenecBernhard Englitz

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