Abstract
Sound pressures required for various levels of detection performance, in the absence of external masking, are summarized in iso-detectability contours. Each such contour shows, for frequencies from 125 to 4000 Hz, the SPL of 150-msec tone pulses which yield a specific probability of correct decisions in a two-alternative, temporal, forced-choice psychophysical procedure (2ATFC). Detection in the absence of externally introduced masking noise is found to differ in no qualitative ways from that in the presence of noise. Additional results suggest a spectrum of “internal noise” which is essentially a critical ratio below the sound pressure level of low-detectability (d′ = 1.0) tones in the quiet. Iso-detectability contours for detection performance of 55% and 99% correct in the 2ATFC procedure are found to enclose the range of sound pressure levels currently accepted as audiometric zero (ISO). [Work supported by the National Institutes of Health, Public Health Service, U. S. Department of Health, Education and Welfare.]
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