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Mammalian behavior and physiology converge to confirm sharper cochlear tuning in humans

Sumner, Christian; Wells, Toby; Bergevin, Christopher; Sollini, Joseph; Kreft, Heather; Palmer, Alan; Oxenham, Andrew; Shera, Christopher

Authors

Christian Sumner

Toby Wells

Christopher Bergevin

Joseph Sollini

Heather Kreft

Alan Palmer alan.palmer@ihr.mrc.ac.uk

Andrew Oxenham

Christopher Shera

Abstract

Frequency analysis of sound by the cochlea is the most fundamental property of the auditory system. Despite its importance, the resolution of this frequency analysis in humans remains controversial. The controversy persists because the methods used to estimate tuning in humans are indirect and have not all been independently validated in other species. Some data suggest that human cochlear tuning is considerably sharper than that of laboratory animals, while others suggest little or no difference between species. We show here in a single species (ferret) that behavioral estimates of tuning bandwidths obtained using perceptual masking methods, and objective estimates obtained using otoacoustic emissions, both also employed in humans, agree closely with direct physiological measurements from single auditory-nerve fibers. Combined with new human behavioral data, this outcome indicates that the frequency analysis performed by the human cochlea is of significantly higher resolution than found in common laboratory animals. This finding raises important questions about the evolutionary origins of human cochlear tuning, its role in the emergence of speech communication, and the mechanisms underlying our ability to separate and process natural sounds in complex acoustic environments.

Journal Article Type Article
Publication Date Oct 15, 2018
Electronic ISSN 1091-6490
Publisher National Academy of Sciences
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1073/pnas.1810766115
Publisher URL http://www.pnas.org/content/early/2018/10/11/1810766115

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Mammalian Behavior And Physiology Converge To Confirm Sharper Cochlear Tuning In Humans - Sep 2018 (1.2 Mb)
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