The range of spectral integration

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Abstract
Complementary detection tasks [2] using digitally synthesized noise are reported. In 1 experiment the band width of the synthetic noise was varied to reveal the region most effective in masking a 1 kHz signal in the human auditory system. The bandwidth of the internal filter (critical band) so measured was about 80 Hz. In another experiment, a wideband noise was used as the masker for a synthetic signal whose bandwidth was varied to determine the maximum effective width of the internal filter. Although some earlier experiments suggest maximum effective widths as small as 180-200 Hz (around 1 kHz), the data reported here indicate the range of spectral integration extends from the critical band to a maximum width that may exceed 3 kHz. The agreement between the 2 experiments suggests a new method for estimating critical bandwidths based on the determination of 2 thresholds: that of a tonal signal in a wideband masker and that of a supracritical-width noise signal in a wider-bandwidth masker.

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