Abstract
Sound streams were generated by randomly choosing the levels of tone pips from two different distributions, A and B. Of the 18 tone pips, the first nine were drawn from distribution A and the second nine from distribution B, or the opposite. The listeners' task was to indicate order, A-B or B-A. In two conditions the A and B distributions differed in mean (condition 1) or variance (condition 2). In contrast to an ideal observer, listeners' strategies were consistent across the two conditions. Analyses suggest that listeners relied primarily on the more intense tone pips in making their decisions.
Highlights
Changes in the acoustical environment are associated with changes in the pattern of sound intensity as a function of time and frequency
Of the 18 tone pips, nine had levels drawn from one discrete distribution and the other nine sequential tone pips had levels drawn from a different discrete distribution
Following data collection the two subjects (S1 and S3) demonstrating the best sensitivity in condition 2 were tested using discrete distributions based on 3rd-order Legendre polynomial using tones in the 1000-Hz frequency region
Summary
Changes in the acoustical environment are associated with changes in the pattern of sound intensity as a function of time and frequency. Adding noise to another noise leads to changes in several features of the sound including increases in the mean and variance of the sound’s intensity It is of interest, to evaluate listeners’ ability to detect changes in the distributions of levels across time. The resulting relative weights provide an estimate of the relative contribution of tones of different levels and tones presented at different times to listeners’ decisions, assuming a linear combination of levels These relative weights are evaluated relative to two potential models of processing. Unlike the ideal observer model, for the level dominance model listeners rely on the more intense tone pips regardless of the condition being tested. The goals of the current experiment were to (a) begin to evaluate the mechanisms underlying judgments regarding changes in the statistics within a single sound stream and (b) using relative weights, compare listeners’ strategies with two models: an ideal observer and an observer relying predominantly on the more intense sounds
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