| Evaluating dedicated and intrinsic models of temporal encoding by varying context. | |
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MedLine Citation:
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PMID: 19487188 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two general classes of models have been proposed to account for how people process temporal information in the milliseconds range. Dedicated models entail a mechanism in which time is explicitly encoded; examples include clock-counter models and functional delay lines. Intrinsic models, such as state-dependent networks (SDN), represent time as an emergent property of the dynamics of neural processing. An important property of SDN is that the encoding of duration is context dependent since the representation of an interval will vary as a function of the initial state of the network. Consistent with this assumption, duration discrimination thresholds for auditory intervals spanning 100 ms are elevated when an irrelevant tone is presented at varying times prior to the onset of the test interval. We revisit this effect in two experiments, considering attentional issues that may also produce such context effects. The disruptive effect of a variable context was eliminated or attenuated when the intervals between the irrelevant tone and test interval were made dissimilar or the duration of the test interval was increased to 300 ms. These results indicate how attentional processes can influence the perception of brief intervals, as well as point to important constraints for SDN models. |
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Authors:
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Rebecca M C Spencer; Uma Karmarkar; Richard B Ivry |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Review |
Journal Detail:
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Title: Philosophical transactions of the Royal Society of London. Series B, Biological sciences Volume: 364 ISSN: 1471-2970 ISO Abbreviation: Philos. Trans. R. Soc. Lond., B, Biol. Sci. Publication Date: 2009 Jul |
Date Detail:
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Created Date: 2009-06-02 Completed Date: 2009-08-27 Revised Date: 2010-09-24 |
Medline Journal Info:
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Nlm Unique ID: 7503623 Medline TA: Philos Trans R Soc Lond B Biol Sci Country: England |
Other Details:
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Languages: eng Pagination: 1853-63 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Massachusetts Amherst, Amherst, MA 01003, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Brain
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physiology* Humans Models, Neurological* Psychophysics Time Perception / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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AG 29710/AG/NIA NIH HHS; F32 NS 048012/NS/NINDS NIH HHS; HD 060306/HD/NICHD NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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