Binaural-level functions in ferret auditory cortex: evidence for a continuous distribution of response properties

Journal of Neurophysiology
Robert A A CampbellAndrew J King

Abstract

Many previous studies have subdivided auditory neurons into a number of physiological classes according to various criteria applied to their binaural response properties. However, it is often unclear whether such classifications represent discrete classes of neurons or whether they merely reflect a potentially convenient but ultimately arbitrary partitioning of a continuous underlying distribution of response properties. In this study we recorded the binaural response properties of 310 units in the auditory cortex of anesthetized ferrets, using an extensive range of interaural level differences (ILDs) and average binaural levels (ABLs). Most recordings were from primary auditory fields on the middle ectosylvian gyrus and from neurons with characteristic frequencies >5 kHz. We used simple multivariate statistics to quantify a fundamental coding feature: the shapes of the binaural response functions. The shapes of all 310 binaural response surfaces were represented as points in a five-dimensional principal component space. This space captured the underlying shape of all the binaural response surfaces. The distribution of binaural level functions was not homogeneous because some shapes were more common than others. Despite this, c...Continue Reading

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Citations

Apr 26, 2013·Journal of the Association for Research in Otolaryngology : JARO·Peter KeatingAndrew J King
Apr 10, 2009·The Journal of the Acoustical Society of America·Daniel KumpikAndrew J King
Mar 12, 2010·Journal of Neurophysiology·Robert A A CampbellJan W H Schnupp
May 13, 2011·Journal of Neurophysiology·Douglas E H HartleyJan W H Schnupp
Oct 29, 2010·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Nathan C HigginsHeather L Read
Oct 16, 2015·Journal of the Association for Research in Otolaryngology : JARO·Susan A McLaughlinG Christopher Stecker
Feb 23, 2007·Hearing Research·Andrew J KingJan W H Schnupp
Aug 4, 2011·Cochlear Implants International·Jochen TilleinAndrej Kral
Dec 18, 2013·Journal of Neurophysiology·Michael KywerigaMichael Wehr
Jun 29, 2007·Journal of Neurophysiology·Jennifer K BizleyAndrew J King
Sep 5, 2014·Journal of Neurophysiology·Michael KywerigaMichael Wehr
May 15, 2015·Journal of Neurophysiology·Heath G JonesDaniel J Tollin
Apr 11, 2019·ELife·Dmitry KobakAlfonso Renart

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