NDLI: Six Degrees of Auditory Spatial Separation.

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Six Degrees of Auditory Spatial Separation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Carlile, Simon Fox, Alex Orchard-Mills, Emily Leung, Johahn Alais, David
Description	Country affiliation: Australia Author Affiliation: Carlile S ( School of Medical Sciences, University of Sydney, Sydney, NSW, 2006, Australia. simonc@physiol.usyd.edu.au.); Fox A ( Bosch Institute, University of Sydney, Sydney, NSW, 2006, Australia. simonc@physiol.usyd.edu.au.); Orchard-Mills E ( School of Medical Sciences, University of Sydney, Sydney, NSW, 2006, Australia.); Leung J ( School of Medical Sciences, University of Sydney, Sydney, NSW, 2006, Australia.); Alais D ( School of Psychology, University of Sydney, Sydney, NSW, 2006, Australia.)
Abstract	The location of a sound is derived computationally from acoustical cues rather than being inherent in the topography of the input signal, as in vision. Since Lord Rayleigh, the descriptions of that representation have swung between 'labeled line' and 'opponent process' models. Employing a simple variant of a two-point separation judgment using concurrent speech sounds, we found that spatial discrimination thresholds changed nonmonotonically as a function of the overall separation. Rather than increasing with separation, spatial discrimination thresholds first declined as two-point separation increased before reaching a turning point and increasing thereafter with further separation. This 'dipper' function, with a minimum at 6 ° of separation, was seen for regions around the midline as well as for more lateral regions (30 and 45 °). The discrimination thresholds for the binaural localization cues were linear over the same range, so these cannot explain the shape of these functions. These data and a simple computational model indicate that the perception of auditory space involves a local code or multichannel mapping emerging subsequent to the binaural cue coding.
File Format	HTM / HTML
ISSN	15253961
Issue Number	3
Journal	Journal of the Association for Research in Otolaryngology
Volume Number	17
e-ISSN	14387573
Language	English
Publisher	Springer
Publisher Date	2016-06-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Otolaryngology
Content Type	Text
Resource Type	Article
Subject	Otorhinolaryngology Sensory Systems

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