| Development of directional motion symmetry in the monocular visually evoked potential of infant monkeys. | |
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MedLine Citation:
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PMID: 9666993 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Motion processing in humans and monkeys exhibit a directional asymmetry during infancy which is not present in adults except following abnormal visual rearing conditions. To characterize the time course for maturation of a symmetric response, we measured the monocular visually evoked potential (MVEP) response to 0.26 c/deg gratings oscillating horizontally at 6 Hz in 13 infant rhesus monkeys between 1 and 52 weeks of age. An asymmetric (F1) and a symmetric (F2) frequency component were extracted from the MVEP using Fourier analysis. At early ages the asymmetric F1 component measured from the two eyes exhibited a 180 deg interocular phase shift, demonstrating that there was a directional bias in opposite directions between the left and right eyes. Although our methods could not determine whether the bias was in the nasal or temporal direction, our results would be consistent with a nasal bias, as has been observed in previous motion studies. Magnitude of the asymmetry was quantified in the form of an asymmetry index, F1/(F1 + F2). Based on developmental changes in the asymmetry index, and phase and amplitudes of F1 and F2, we conclude that the MVEP loses its directional asymmetry at 6 weeks of age. The development of directional motion symmetry observed in monkeys over the first 6 weeks is similar to that observed in humans over the first 5 months. |
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Authors:
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R J Brown; J R Wilson; A M Norcia; R G Boothe |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 38 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1998 May |
Date Detail:
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Created Date: 1998-07-27 Completed Date: 1998-07-27 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: 1253-63 Citation Subset: IM; S |
Affiliation:
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Division of Visual Science, Yerkes Regional Primate Research Center, Atlanta, GA 30322, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aging Animals Evoked Potentials, Visual* Macaca mulatta Motion Perception / physiology* Pattern Recognition, Visual / physiology Vision, Monocular |
| Grant Support | |
ID/Acronym/Agency:
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EY05975/EY/NEI NIH HHS; RR00165/RR/NCRR NIH HHS; T32EY07092/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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