Abstract
It is widely suspected that sound localization is accomplished primarily through the use of low-frequency interaural-time-difference (ITD) cues and only secondarily via high-frequency ITD and level-difference (ILD) cues [Rayleigh, Philos. Mag. 13, 214–232 (1907); Wightman and Kistler, JASA 91, 1648-1661 (1992); Macpherson and Middlebrooks JASA 111, 2219–2236 (2002)]. Contemporary studies of cross-frequency interactions in spatial hearing have provided support for this view but have not directly identified the frequencies involved nor quantified the relative weighting of binaural cues weighting across components of a single complex. This study adapted the temporal-weighting approach of Stecker and Hafter [JASA 112, 1046–1057 (2002)] to measure spectral weighting functions (SWF) for (a) free-field and reverberant sound localization and (b) lateralization based on ITD and/or ILD. Across a wide range of conditions, SWFs featured enhanced weights for components in the vicinity of 400-800 Hz, supporting a narrow “dominance region” for localization and lateralization of complex sounds [Bilsen and Raatgever, Acoustica 28, 131–132 (1973)], and a precipitous drop in weights between 800 and 1400 Hz [Brughera et al., JASA 133, 2839–2855 (2013)]. [Work supported by NIH R01-DC016643.]
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