Intensity discrimination as a function of frequency and sensation level

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Abstract
Intensity discrimination [in man] was measured for pulsed sinusoids of various frequencies (200-8000 Hz) and sensation levels (5-80 dB). The data for all frequencies were fitted by a single function, .DELTA.I/I = 0.463 (I/I0)-0.072, where I0 is intensity at threshold, I is the intensity of the tone and .DELTA.I is the increment needed to obtain 71% correct in a 2-interval forced-choice adaptive procedure. The form of this function was in good agreement with data reported in comparable studies but differs markedly from the data reported by Riesz. An analysis of the actual values of .DELTA.I/I reported in the other studies indicated a range larger than would be predicted on the basis of individual differences among observers in this study. The data were also discussed in terms of the predictions of current theoretical models.

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