Interaural Phase and the Absolute Threshold for Tone

Abstract
The present study agrees with earlier ones that the binaural absolute threshold is about 3 dB lower than the monaural. It also finds that reversing the interaural phase of the signal lowers the threshold still further. The findings indicate the likelihood that so-called absolute thresholds are really masked thresholds, with the masking noise present internally and exhibiting a small positive correlation. The relation of these results to earlier work on binaural masking phenomena is discussed.

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