Abstract
Binaural masking level differences (BMLDs) were obtained for pulse train signals in a 2IFC task in which the noise (Nπ) level was controlled by a PEST program. The signal in one channel was a random polarity (+1, −1) pulse train composed of 60 100-μsec-duration pulses with an interpulse period of 2 msec. Signal correlation was varied by modifying the signal in the contralateral channel. The correlation was varied by (a) randomly inverting some of the pulses, (b) randomly deleting some of the pulses, (c) deleting or inverting some of the pulses contingent on their polarity, or (d) delaying the pulses by an integral number of pulse periods. The data were compared to predictions generated from Osman's correlation model. Performance was found to be accurately predicted by the model for conditions (a), (b), and (d). Differences between the model and the data for condition (c) were explained in terms of changes in the monaural detectability of the contralateral signal.
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