Lateralization of low-frequency, complex waveforms: The use of envelope-based temporal disparities

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Abstract
Several recent investigations suggest that listeners either cannot or do not use envelope-based interaural temporal disparities (ITD) to lateralize low-frequency sounds. Listeners in those studies may have been unable to process envelope-based ITD principally because of the types of stimuli utilized. In this study an acoustic pointing task was employed in which listeners varied the interaural intensive difference of a 500-Hz narrow-band noise (the pointer) so that it matched the intracranial position of a second, experimenter-controlled stimulus (the target). Targets were sinusoidally amplitude-modulated tones centered on 500 Hz or 1 kHz, and modulated at 25, 50, or 100 Hz. Targets were presented with either the entire waveform delayed or with only the envelope delayed. Delays of the envelope do affect the lateral position of low-frequency targets. The envelope-based cues appear to interact with those provided by the dominant fine structure.

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