Intensity perception. IV. Resolution in roving-level discrimination

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Abstract
This paper reports the results of some preliminary two-interval roving-level discrimination experiments designed to test certain predictions of the preliminary theory of intensity resolution presented in the first paper of this series [N. I. Durlach and L. D. Braida, J. Acoust. Soc. Am. 46, 372–383 (1969)]. Discrimination performance was measured for roving-level ranges in the interval 0 to 54 dB and intersignal durations in the interval 0 to 9 sec. Although the results, when averaged over levels, are roughly consistent with the theory, there is a substantial dependence of sensitivity on level that is inconsistent with the theory. Much of this dependence appears to be similar to that found previously in one-interval experiments [L. D. Braida and N. I. Durlach, J. Acoust. Soc. Am. 51, 483–502 (1972)], and to be interpretable in terms of deviations from Weber's law and the edge effect (caused by the use of the extreme intensities in the stimulus set as perceptual anchors).

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