Two-channel auditory signal detection was investigated with narrow-band noise signals masked by independent, binaurally uncorrelated noise. The two-channel tasks included conditions where the signals in each channel were correlated, uncorrelated, or opposite in phase. No significant differences were observed between the single-channel conditions and the two-channel correlated signal condition, but performance in the uncorrelated and 180° phase conditions was significantly poorer. A comprehensive analysis of cross-channel interaction indicated a cross-channel inhibitory or masking effect, which may be counteracted by the presence of lateralization cues. Constraints on signal detectability due to a limited processing capacity appeared to be negligible.
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Sorkin et al. (1972) studied this question.
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