Abstract
Recent studies of the relation between loudness and intensity jnd's suggest that the size of the jnd corresponds to loudness magnitude rather than to the slope of the loudness function. Specifically, Zwislocki and Jordan [J. Acoust. Soc. Am. Suppl. 1 77, S64 (1985)] conclude that the intensity jnd's for a pure tone are equal in recruiting and normal ears when the loudnesses of the tones are equal. Similarly, Hellman et al. [J. Acoust. Soc. Am. Suppl. 1 77, S64 (1985)] conclude that when a pure tone in narrow‐band noise is judged to be equally loud to a tone in wideband noise, the jnd's for those tones are the same. We show exception to these studies. Loudness matches and intensity jnd's for a 1000‐Hz pure tone in quiet and in a 40‐dB spectrum level broadband noise were obtained for four normal‐hearing subjects. The data indicate that equally loud tones yield equal jnd's only at intensities near threshold and at high intensities where equal loudness corresponds to equal SPL. At other intensities, the jnd is larger in noise than in quiet. [Supported by NIH NS12125, NS07889, and by a training grant, NICHHD T32 HD‐07151, awarded to CMR by the Center for Research in Human Learning.]
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