The Influence of Interaural Phase on Masked Thresholds I. The Role of Interaural Time-Deviation

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Abstract
When a narrow band of noise of constant level (the signal) is masked by a wider band of noise (the masker) the amt. of noise required to drown out the signal often depends significantly upon the interaural phase relations of signal and masker, and out-of-phase showing an advantage in audibility. The advantage is very striking for a signal near 250 cps; and falls off progressively toward 1400 cps, above which it is small. At all frequencies between 250 and 6000 cps the level of masking, for a signal in phase at the ears, remains relatively constant. With the out-of-phase signal, the decline in level of masking as a function of frequency, is such as to hold the interaural time-deviation (for the 90[degree] position) constant at about 125 microsec. Tonal signals tend to show a decreasing critical time-deviation with increasing frequency.

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