Abstract
A recent model relating measures of loudness and intensity discrimination [W. S. Hellman and R. P. Hellman, J. Acoust. Soc. Am. 87, 1255–1265 (1990)] is shown to reveal that the near threshold slope of +1 obtained for the loudness function requires the near threshold slope of the Weber function for intensity discrimination to be −1. This result is consistent with psychophysical intensity discrimination measurements for pure tones and broadband noise, as well as with theoretical considerations which predict that the Weber function should have a slope of −1 as the detection threshold is approached [N. F. Viemeister, Auditory Function, 213–241 (1988)]. The model also generates the overall shape of the Weber function over a suprathreshold range of sound pressure levels up to 80 dB. Empirical examples are provided. [Partially supported by the Rehab. R. & D. Service of the VA.]
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