| Infants' sensitivity to statistical distributions of motion direction and speed. | |
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MedLine Citation:
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PMID: 10615506 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Adults combine different local motions to form a global percept of motion. This study explores the origins of this process by testing how perturbations of local motion influence infants' sensitivity to global motion. Infants at 6-, 12-, and 18-weeks of age viewed random dots moving with a gaussian distribution of dot directions defined by a mean of 0 degree (rightward) or 180 degrees (leftward) and a standard deviation (SD) of 0, 34, or 68 degrees. A well-practiced observer used infants' optokinetic responses to judge the direction of stimulus motion. Infants were studied both cross-sectionally and longitudinally. Direction discrimination was relatively high at all ages when the SD was 0 degree. When the SD was 34 or 68 degrees, performance declined with age. Adult performance was nearly perfect at these SDs. A similar developmental pattern was found with distributions of dot speed. The decline in infant performance is consistent with the development of both neural tuning and receptive field size. The subsequent improvement by adulthood suggests the development of additional processes such as long-range interactions. |
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Authors:
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T Banton; B I Bertenthal; J Seaks |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 39 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1999 Oct |
Date Detail:
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Created Date: 2000-01-24 Completed Date: 2000-01-24 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 3417-30 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Virginia, Charlottesville 22903, USA. tab2v@virginia.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Child Development / physiology* Computer Graphics Cross-Sectional Studies Eye Movements Humans Infant Longitudinal Studies Motion Perception / physiology* Psychological Tests Sensory Thresholds / physiology Visual Acuity / physiology |
| Grant Support | |
ID/Acronym/Agency:
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HD16195/HD/NICHD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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