| Infant sensitivity to radial optic flow fields during the first months of life. | |
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MedLine Citation:
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PMID: 18484844 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Little is known about the development of the sensitivity for "optic flow," a large-scale pattern perceived during locomotion. The present study aimed to examine infants' coherence thresholds to radial optic flow motion during the first months of life. Using a forced-choice preferential looking technique, infants' sensitivities were measured with a moving radial stimulus varying in coherence on one side and a corresponding non-directional radial noise pattern on the other. Coherence thresholds for 11 infants from each of 2, 4, 6, 8, and 10 months of age groups were studied by a constant stimuli method. In the second experiment, seven infants were followed longitudinally (tested at 2, 4, 6, and 8 months) using the same stimuli. Results of both studies demonstrated significant improvement for the sensitivity of expanding radial motion during the first months of life. Finally, the 2 directions of radial motion were tested (expanding and contracting) for participants followed longitudinally (from 2 to 8 months). Data showed superior sensitivity for expansion versus contraction direction of motion. This dissociation may suggest that sensitivity to direction corresponding with forward locomotion (expansion) develops at a faster rate than the opposite direction encountered when moving backwards (contraction). The sensitivity improvement for expanding patterns likely reflects the maturation of cerebral areas subtending motion integration in infancy. |
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Authors:
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Odile Brosseau-Lachaine; Christian Casanova; Jocelyn Faubert |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2008-04-11 |
Journal Detail:
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Title: Journal of vision Volume: 8 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2008 |
Date Detail:
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Created Date: 2008-05-19 Completed Date: 2008-06-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: 5.1-14 Citation Subset: IM |
Affiliation:
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Visual Psychophysics and Perception Laboratory, School of Optometry, University of Montreal, Montreal, QC, Canada. odile.brosseau-lachaine@umontreal.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Contrast Sensitivity / physiology* Female Follow-Up Studies Humans Infant Locomotion / physiology* Male Motion Perception Photic Stimulation Sensory Thresholds Visual Cortex / growth & development* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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