Abstract
An experiment was carried out to measure the auditory masking effect of an intense noise burst on a preceding weak stimulus. A short 1000-cycle tone preceded a burst of white noise by a variable silent interval. The threshold intensity level of the tone was taken as a measure of the masking provided by the noise burst. The effects were examined of combinations of the following conditions: tone-durations of 5, 10, 25, and 50 msec; silent intervals of 0, 2, 5, 10, 25, and 100 msec; and noise burst levels of 75, 95, 105, 115, and 125 db SPL. Appreciable elevations of tone threshold were observed for tone-duration less than 25 msec, with silent intervals less than 25 msec, and at noise burst levels above 95 db. Threshold elevations increased progressively as noise burst level was increased. The latter effect increased with shorter tones and with shorter silent intervals.
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