Abstract
Observers centered a target sound in the presence of a simultaneously gated distractor. Observers controlled either the interaural time difference (ITD) or interaural level difference (ILD) of a 50-Hz-wide target band of noise that had a center frequency of either 500 or 2000 Hz. The distractor was a 50-Hz wide band of noise with a center frequency of either 250, 500, 1000, 2000, or 4000 Hz. The target and distractor were gated on and off repeatedly within a trial, each presentation having a 150-ms steady-state portion. The ITD (or ILD) of the distractor varied from trial to trial. The effect of the distractor ITD (or ILD) on the lateral position of the target was assessed by the magnitude of the target ITD (or ILD) that was needed to center the target. The distractor ITD influenced the ITD-centered 2000-Hz target to a greater extent than the 500-Hz target, whereas the distractor ILD had an approximately equal effect on the ILD-centered targets at both frequencies. [Work supported by NIH.]
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