Abstract
The ability of a listener to make use of interaural level differences (ILDs) or envelope interaural time differences (ITDs) carried by modulated high-frequency sounds depends critically on the modulation period. Specifically, periods shorter than 4–5 ms substantially reduce the availability of ongoing cues, with the consequence that localization and discrimination increasingly rely on onset cues as the period decreases. Over the past several years, the authors have studied this dependence by measuring listeners’ detection of dynamic ITD and ILD, their temporal weighting of both cues during localization tasks, and their perception of simulated sources and echoes (i.e., precedence effects) carrying one or both cues. This presentation will review the results of those studies, which suggest that (a) onsets dominate processing of both cues at high rates; (b) postonset ILD sensitivity is better maintained, compared to postonset ITD, at high rates; (c) sensitivity to postonset ILD, but typically not ITD, exhibits a temporally increasing profile consistent with binaural temporal integration of that cue; and (d) maintained sensitivity to postonset ILD allows changes in that cue, but not ITD, to cause “breakdown” of precedence effects. [Work supported by NIH Grant Nos. R03 DC009482 and F31 DC010543, and NSF Grant No. IOB-0630338.]
Published Version
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