Detection of interaural delay in high-frequency noise

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Abstract
Subjects’ ability to detect interaural time delays was investigated with four 270-Hz wide bands of noise centered at 4 kHz which differed only in the slope of their low-frequency skirts. Sensitivity to interaural delay increased dramatically with decreases in the slope of the low-frequency skirt. Performance was unaffected by the addition of noise high passed at 3 kHz, but was seriously degraded by the addition of noise low passed at 3 kHz. When only the low-frequency skirt of one of the four noise bands was presented, performance was slightly poorer than that obtained with the entire band. The data strongly suggest that the primary cue was provided by interaural delays of the low-level, low-frequency portions of the nominally high-frequency bands of noise. That is, consistent with Yost et al. [J. Acoust. Soc. Am. 50, 1526–1530 (1971)], who used transients, the subjects were not utilizing differences in the envelopes of the high-frequency noise bands.

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