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Monaural detection with contralateral cue (MDCC). II. Interaural delay of cue and signal.

In a monaural detection with contralateral cue (MDCC) task, subjects detect a masked signal presented monaurally. A cue containing information relevant to the signal is presented to the other ear. We used a burst of noise as the signal and the same noise burst delayed or advanced by up to 2400 μsec as the cue. For most subjects, performance was best when the cue and signal were approximately simultaneous. When the cue led by about 800 μsec, performance dropped sharply to levels below those obtained without the cue, recovering to the uncued level for yet longer disparities. When the signal led the cue, performance dropped smoothly as a function of timing disparity, and for signal lead greater than about 1000 μsec, the cue had little effect on performance. Although the task subjectively is one of judging the apparent lateralization of the cue, we argue that the lateralization mechanism is not by itself the detecting mechanism.