Abstract
This is a repetition and an extension of a study of the effect of the interaural correlation for a masking noise upon the masked threshold for a 500-cps tone, reported in 1953 by Jeffress, Blodgett, and Deatherage. We failed at that time to realize that an uncorrelated noise can produce a masking level difference (MLD), and used the homophasic condition, at each value of the correlation, as the reference level for computing MLD's. In the present study the results are presented as signal-to-noise ratios based on the effective level of the noise. They show, as the results of the earlier study did, a very rapid increase in masking as the correlation is reduced from unity. The change is not, however, as rapid as that associated with the reduction of the autocorrelation for the critical band of noise when a time delay is introduced into the noise channel to one ear. The paper will discuss some of the implications of this fact for hearing theory.
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