| Spatiotemporal coding of signals in the auditory periphery. | |
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MedLine Citation:
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PMID: 20331025 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Signal representation in the cochlea is often thought to involve either rate-place profiles or purely temporal, interspike interval codes. Spatio-temporal coding strategies based on phase-locking, cochlear delays, and coincidence detectors have also been proposed [Loeb et al., Biol. Cybern. (1983); K. & Shamma, J. Acoust. Soc. Am. 107 (2000); and Carney et al., Acoustica 88, 334-337 (2002)]. In this view, spatiotemporal patterns of spikes locked to relative phases of the traveling wave at specific cochlear places at a given time can convey information about a tone. We propose a general mathematical basis for using such spatial phaseamplitude patterns along the frequency axis to represent an arbitrary (approximately) time and bandwidth-limited signal. We posit that the spatial pattern of phases and amplitudes corresponds to locations at which (real andor imaginary parts of) the Fourier transform of the signal crosses certain levels (e.g., zero level). Given these locations, we show that we can accurately reconstruct the original signal by solving a simple eigenvalue problem. Using this approach, we propose an analysissynthesis algorithm to represent speech-like signals. We conjecture that a generalized representation of the forms of signals can be inferred from spatial, cross-CF patterns of phase relations present in the auditory nerve. [Work supported by AFSOR FA9550-09-1-0119.]. |
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Authors:
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Ramdas Kumaresan; Vijay Peddinti; Peter Cariani |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 1988 Citation Subset: IM |
Affiliation:
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Dept. of Elec. and Comput. Eng., Univ. of Rhode Island, Kelley Hall, Kingston, RI 02881Harvard Med. School, Newton, MA 02460. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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