The segregation of SAM 4‐kHz targets from SAM 2‐kHz distractors on the basis of interaural envelope delay

A stimulus‐classification paradigm was used to examine the extent to which judgments of the laterality of 4‐kHz targets, sinusoidally amplitude modulated at 200 Hz, were influenced by 2‐kHz distractors that were modulated at rates ranging from 50 to 400 Hz. On each trial, the target was presented with one of ten envelope delays (ranging from −250 to +250 μs in 50‐μs steps), as was the distractor. Each test interval was preceded by a diotic presentation of the target alone. The duration of the signals was 200 ms. During a block of 100 trials, each combination of target‐distractor delay was presented once. The relative salience of the envelope delays carried by the target and the distractor was assessed by the slope of the best linear boundary between left and right responses. Two listeners gave increasing weight to the target as the difference between the target and distractor modulation frequencies increased, but weighed that target and distractor equally when both were modulated at 200 Hz. Two other list...