| Two-dimensional optokinetic nystagmus induced by moving plaids and texture boundaries. Evidence for multiple visual pathways. | |
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MedLine Citation:
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PMID: 1634347 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Horizontal and vertical components of optokinetic nystagmus (OKN) were measured using the magnetic search coil technique in normal human adults during presentation of simple and complex moving patterns. Simple patterns were gratings moving horizontally and obliquely. Complex moving patterns consisted of plaids formed by superimposed oblique motion of two sets of gratings or of illusory contours formed by offset discontinuities in gratings. Slow-phase OKN gains (eye velocity divided by stimulus velocity) induced by high-contrast type I and type II plaids were comparable with those generated by one-dimensional moving gratings. The axis of OKN for high-contrast plaids was along the resultant direction determined by the intersection-of-constraints rule and not along any component. With low-contrast presentations, OKN induced by type I patterns remained in the resultant direction, but the OKN direction induced by type II patterns was biased toward the components' directions. The OKN generated by texture boundaries embedded in real pattern motion was measured for motion of illusory contours having systematically varying directions. The gain of OKN induced by real motion was independent of the direction of illusory contour motion, but the gain to illusory contour motion decreased with increasing contour angles. All these results suggest that input signals for driving the optokinetic system come from visual areas extracting higher order two-dimensional motion information. |
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Authors:
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C Yo; J L Demer |
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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: Investigative ophthalmology & visual science Volume: 33 ISSN: 0146-0404 ISO Abbreviation: Invest. Ophthalmol. Vis. Sci. Publication Date: 1992 Jul |
Date Detail:
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Created Date: 1992-08-21 Completed Date: 1992-08-21 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2490-500 Citation Subset: IM; S |
Affiliation:
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Visual Sciences Center, University of Chicago, Illinois. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Form Perception
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physiology* Humans Motion Perception / physiology* Nystagmus, Physiologic / physiology* Pattern Recognition, Visual / physiology Visual Pathways / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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5 T32 GM07281/GM/NIGMS NIH HHS; EY08656/EY/NEI NIH HHS; NS09823/NS/NINDS NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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