Abstract
The interaction of masker and suppressor levels was investigated for a narrow-band noise masker (60 Hz wide centered at 1000 Hz) and sinusoidal suppressors at 500, 800, 1120, and 1400 Hz. Forward-masked threshold for a 10-ms, 1000-Hz sinusoidal signal was determined as a function of suppressor level (ranging from 30 to 90 dB SPL) for each of five masker levels (30, 40, 50, 60, and 70 dB SPL total noise power). The results for suppressors below the masker frequency are as predicted by the class of models based on bandpass nonlinearities. Although the form of the data is qualitatively the same for suppressors above the masker frequency, these data do not show a lower limit corresponding to the excitatory effect of the suppressor alone, as do the data for the lower frequency suppressors. [Research supported by NSF and NIH.]
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