| Coherence thresholds for discrimination of motion direction in infants. | |
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MedLine Citation:
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PMID: 8160401 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The sensitivity of 3-month-old infants to direction of motion in random-dot patterns was assessed by measuring coherence thresholds for the discrimination of a pattern, in which opposite directions were segregated into alternate horizontal strips, from an unsegregated pattern. The coherently moving dots had a displacement size of 0.16 deg (velocity 8 deg/sec), and their direction of motion reversed periodically. For both infants and an adult subject coherence thresholds decreased with increasing height of the segregated strips, and with increasing duration of the interval between direction reversals. However the infants required larger minimum heights and longer minimum durations in order to extract motion direction. Even under the best conditions infants were markedly less sensitive, with coherence thresholds of around 50%, compared with 5-7% for the adult. In addition, within the group of infants coherence thresholds were negatively correlated with age. This developmental increase in motion sensitivity at an intermediate velocity suggests that a large part of the improvement in upper and lower velocity thresholds during development is a result of a uniform increase in sensitivity across all velocities, though the results do not rule out additional specific improvements in sensitivity at the extremes of the velocity range. |
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Authors:
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J Wattam-Bell |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Vision research Volume: 34 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1994 Apr |
Date Detail:
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Created Date: 1994-05-18 Completed Date: 1994-05-18 Revised Date: 2006-11-15 |
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: 877-83 Citation Subset: IM |
Affiliation:
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University of Cambridge, Department of Experimental Psychology, England. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Age Factors Child Development Discrimination (Psychology) / physiology Humans Infant Male Motion Perception / physiology* Pattern Recognition, Visual / physiology Sensory Thresholds / physiology Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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