| Level-dependent latency shifts quantified through binaural processing. | |
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MedLine Citation:
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PMID: 20702738 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The mammalian binaural system compares the timing of monaural inputs with microsecond precision. This temporal precision is required for localizing sounds in azimuth. However, temporal features of the monaural inputs, in particular their latencies, highly depend on the overall sound level. In a combined psychophysical, electrophysiological, and modeling approach, we investigate how level-dependent latency shifts of the monaural responses are reflected in the perception and neural representation of interaural time differences. We exploit the sensitivity of the binaural system to the timing of high-frequency stimuli with binaurally incongruent envelopes. Using these novel stimuli, both the perceptually adjusted interaural time differences and the time differences extracted from electrophysiological recordings systematically depend on overall sound pressure level. The perceptual and electrophysiological time differences of the envelopes can be explained in an existing model of temporal integration only if a level-dependent firing threshold is added. Such an adjustment of firing threshold provides a temporally accurate neural code of the temporal structure of a stimulus and its binaural disparities independent of overall sound level. |
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Authors:
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Ida Siveke; Christian Leibold; Katharina Kaiser; Benedikt Grothe; Lutz Wiegrebe |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-11 |
Journal Detail:
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Title: Journal of neurophysiology Volume: 104 ISSN: 1522-1598 ISO Abbreviation: J. Neurophysiol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-05 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: United States |
Other Details:
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Languages: eng Pagination: 2224-35 Citation Subset: IM |
Affiliation:
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Division of Neurobiology, Department Biologie II, Ludwig-Maximilians-Universität München, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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