Abstract
The temporal masking of a 1000-Hz probe tone by a 70-dB-SPL 1000-Hz masker was investigated using a forward masking paradigm, a backward masking paradigm and a combined forward-backward masking piradigm. The duration of the probe tone was 10 msec with a 4-msec rise-fall time, while the masker duration was 60 msec with a 4-msec rise-fall time. In the forward and backward masking conditions, the masking of the probe tone was measured as a function of the time (ΔT) between the masker and the probe tone. Selected ΔT's from 0 to 20 msec were used. In the combined forward-backward masking conditions, masking was measured as a function of both the inter-masker-interval and the position of the probe in time with respect to the forward and backward maskers. Inter-masker-intervals ranged from 10 to SO msec. Observers' thresholds were measured using a 2ATFC procedure. Combined forward-backward masking conditions produced masking levels which were higher than expected on the basis of a residual power prediction. The difference between observed and predicted masking levels decreased as ΔT-forward or ΔT-backward was increased.
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