Lateralization of low-frequency tones: relative potency of gating and ongoing interaural delays.
Several types of interaural delay can affect the lateral position of binaural signals. Delays can occur within the gating (onset and/or offset) or ongoing portions of the signal, or both. Extent of laterality produced by each of these delays was measured for low-frequency tones with an acoustic pointing task. Relative potency was assessed by presenting the delays singly or in combinations (where the types of delay were consistent or in opposition). Rise/decay time, duration, and frequency of the tonal targets were also varied. The major finding was that ongoing delays were much more potent than gating delays in determining extent of laterality. Gating delays were most effective when the interaural phase of the ongoing portion of the tones was more or less ambiguous with respect to which ear was leading. Many of our findings are qualitatively well described by considering properties of patterns of activity produced within a cross-correlation network by such interaurally delayed signals.
Buell
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Center for Neurological Sciences, University of Connecticut Health Center, Farmington 06030.
Trahiotis
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Bernstein
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D000161:Acoustic Stimulation; D000162:Acoustics; D001307:Auditory Perception / Q000502:physiology*; D006801:Humans; D013017:Sound Localization / Q000502:physiology*; D013997:Time Factors