Abstract
Masked thresholds were obtained in four binaural conditions (N0S0, N0Sm, NπS0, and N0Sπ) and in four temporal-masking conditions (simultaneous masking, forward masking, backward masking, and combined forward–backward masking). In all conditions Gaussian noise was the masker and was low-pass filtered at 5000 Hz and presented at 43-dB spectrum level. The signal was a 20-msec, 500-Hz tone gated with a 5-msec rise-decay time. The temporal interval between signal offset and masker onset (masker duration 500 msec) in the backward-masking condition was 1 msec. The temporal interval between masker offset and signal onset was 10 msec in the forward-masking condition. These same temporal intervals (but 250-msec maskers) were used in the combined forward–backward masking condition. The hierarcy of masking-level differences (MLD’s) was the same in all of the temporal-masking procedures and matched that obtained in the simultaneous masking condition. More additional masking was obtained in the combined forward–backward masking condition for the N0S0 condition than for any of the binaural conditions (N0Sm, NπS0, and N0Sπ).
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