Abstract
The effect of forward masker duration on measures of frequency selectivity was examined in two experiments. Masker duration was 50 or 400 ms, and signal duration was 20 ms, with no delay between masker offset and signal onset. In the first experiment, growth‐of‐masking functions were measured for four normal‐hearing subjects for masker frequencies below, at, or above the 1‐kHz signal frequency, and straight lines were fitted to those functions using a least‐squares criterion. Psychophysical tuning curves (PTC's) and input filter patterns (IFP's) were derived from the fits. In the second experiment, masking patterns (MP's) were measured for a 1‐kHz masker presented at 50, 70, and 90 dB SPL. All three measures (PTC's, IFP's, and MP's) show better frequency selectivity for the 400‐ms masker particularly on the high‐frequency side for the PTC's and IFP's, and on the low‐frequency side for the MP's. These data are consistent with a sharpening of frequency selectivity at a stage prior to the adaptation observed in forward masking. [Work supported by NIH.]
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