The three-channel model of sound localization mechanisms: interaural level differences

The Journal of the Acoustical Society of America
Rachel N DingleDennis P Phillips

Abstract

The current understanding of mammalian sound localization is that azimuthal (horizontal) position assignments are dependent upon the relative activation of two populations of broadly-tuned hemifield neurons with overlapping medial borders. Recent psychophysical work has provided evidence for a third channel of low-frequency interaural time difference (ITD)-sensitive neurons tuned to the azimuthal midline. However, the neurophysiological data on free-field azimuth receptive fields, especially of cortical neurons, has primarily studied high-frequency cells whose receptive fields are more likely to have been shaped by interaural level differences (ILDs) than ITDs. In four experiments, a selective adaptation paradigm was used to probe for the existence of a midline channel in the domain of ILDs. If no midline channel exists, symmetrical adaptation of the lateral channels should not result in a shift in the perceived intracranial location of subsequent test tones away from the adaptors because the relative activation of the two channels will remain unchanged. Instead, results indicate a shift in perceived test tone location away from the adaptors, which supports the existence of a midline channel in the domain of ILDs. Interestingly...Continue Reading

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Nov 22, 2011·Neuroscience and Biobehavioral Reviews·Dennis P PhillipsRachel N Dingle

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Citations

Nov 28, 2012·Journal of the Association for Research in Otolaryngology : JARO·Chen-Chung Lee, John C Middlebrooks
Jan 10, 2013·The Journal of the Acoustical Society of America·Rachel N DingleDennis P Phillips
Dec 7, 2014·The Journal of the Acoustical Society of America·Dennis P PhillipsSusan E Hall
Apr 2, 2016·Journal of the Association for Research in Otolaryngology : JARO·Simon CarlileDavid Alais
Sep 4, 2015·The Journal of the Acoustical Society of America·Katherine C Wood, Jennifer K Bizley
May 12, 2016·Journal of the Association for Research in Otolaryngology : JARO·Paul M BrileyA Quentin Summerfield
Dec 10, 2017·Scientific Reports·Edward J GolobJeffrey R Mock
Jul 11, 2019·Nature Communications·Katherine C WoodJennifer K Bizley
Aug 31, 2019·Nature Reviews. Neuroscience·Kiki van der HeijdenElia Formisano

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