The effects of amplitude perturbation and increasing numbers of components in profile analysis

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

Abstract

In a profile-analysis task, the effect of randomly perturbing the amplitudes of the components of multi-tone stimuli was studied in two experiments. In the first experiment, thresholds for a signal added in-phase to the central component of a standard were measured for different numbers of components in two conditions. In one condition thresholds were measured in blocks for six different "jagged" standards, and in another, thresholds were measured when one of the six standards was chosen randomly on a presentation-by-presentation basis. Regardless of condition, thresholds did not depend on the numbers of components and increased magnitude of perturbation increased thresholds. Moreover, the slope relating thresholds to number of components did not increase with increasing magnitude of perturbation. In the second experiment, the signal consisted of an increase in amplitude of the central components and a decrease in amplitude of the outer components of the standard (a stimulus type which has been shown to maximize the change in threshold with increasing number of components). The amplitudes of component tones were selected randomly on a presentation-by-presentation basis. Thresholds fell with increases in the number of components...Continue Reading

References

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Citations

Jul 8, 2005·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·U LangemannG M Klump
Jan 8, 2008·The Journal of the Acoustical Society of America·Emily Buss
Jan 29, 2009·The Journal of the Acoustical Society of America·Andrew B HornerRichard H Y So
Jan 5, 2002·The Journal of the Acoustical Society of America·W R Drennan, C S Watson
Apr 5, 2002·The Journal of the Acoustical Society of America·Jennifer J Lentz, Marjorie R Leek
Mar 27, 2003·The Journal of the Acoustical Society of America·Jennifer J Lentz, Marjorie R Leek
Oct 14, 2004·The Journal of the Acoustical Society of America·Andrew HornerRichard So

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