Broadened forward-masked tuning curves from intense masking tones: Delay-time and probe-level manipulations

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Abstract
Forward‐masked psychophysical tuning curves were obtained from normal‐hearing listeners under two conditions: lengthened delay time between masker and probe, and increased probe level. Both conditions required higher‐level masking tones and both conditions resulted in broader tuning curves. Comparisons were made of tuning curves obtained with different probe‐level and delay‐time combinations that were chosen to require equivalent masker levels at the probe frequency. Nearly identical tuning‐curve shapes were obtained when masker level at the probe frequency was the same. The results are predicted by a two‐process model, consisting of a nonlinear filter followed by an exponential decay. Tuning‐curve shapes in forward masking appear to be largely dependent upon the masker level (filter output level) at which one attempts to measure them.

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