Abstract
Noise-intensity discrimination was studied as a function of both signal and masker bandwidth. Five bandwidths of noise-ranging from 100 to 10 000 Hz—were employed. Maskers were presented at each of three spectrum levels (5, 25, and 45 dB re 0. 0002 μ bar). Discrimination thresholds were relatively unaffected by changing noise bandwidth over a two-decade range when the signal and masker were filtered together with either continuous or gated presentation of the masker. When the masker bandwidth was greater than that of the signal, the reciprocity between signal power density and signal bandwidth was found to be 5 dB per log unit of bandwidth with continuous maskers and 5–10 dB (depending upon level) with gated maskers. Additionally, a “near-miss” to Weber's law was obtained with narrow-band noise, while discrimination with wide-band stimuli obeyed Weber's law.
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