Efficient coding of natural sounds

The auditory system encodes sound by decomposing the amplitude signal arriving at the ear into multiple frequency bands whose center frequencies and bandwidths are approximately exponential functions of the distance from the stapes. This organization is thought to result from the adaptation of cochl...

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Bibliographic Details
Published inNature neuroscience Vol. 5; no. 4; pp. 356 - 363
Main Author Lewicki, Michael S
Format Journal Article
LanguageEnglish
Published United States Nature Publishing Group 01.04.2002
Subjects
Animals
auditory nerve
Auditory Pathways - physiology
Auditory Perception - physiology
Cochlea - physiology
Cochlear Nerve - physiology
Fourier Analysis
Mathematics
Models, Neurological
Regression Analysis
Sound
Time Factors
Vocalization, Animal
United States
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Summary:The auditory system encodes sound by decomposing the amplitude signal arriving at the ear into multiple frequency bands whose center frequencies and bandwidths are approximately exponential functions of the distance from the stapes. This organization is thought to result from the adaptation of cochlear mechanisms to the animal's auditory environment. Here we report that several basic auditory nerve fiber tuning properties can be accounted for by adapting a population of filter shapes to encode natural sounds efficiently. The form of the code depends on sound class, resembling a Fourier transformation when optimized for animal vocalizations and a wavelet transformation when optimized for non-biological environmental sounds. Only for the combined set does the optimal code follow scaling characteristics of physiological data. These results suggest that auditory nerve fibers encode a broad set of natural sounds in a manner consistent with information theoretic principles.
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ISSN:1097-6256
1546-1726
DOI:10.1038/nn831