| The effect of perceived length on visuomotor localization. | |
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MedLine Citation:
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PMID: 11396394 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The purpose of this experiment was to study visuomotor localization in the presence of either a horizontal array of equally spaced dots or a thin horizontal line. METHODS: Pointing behavior was used to assess directional localization. In experiment 1, subjects were made myopic using a contact lens and then corrected with a spectacle lens. Subjects were tested in the presence and absence of a regularly spaced, horizontal array of dots with and without the contact lens/spectacle combination. In experiment 2, subjects wore the contact lens/spectacle in all cases. Some subjects were tested in the presence and then in the absence of a regularly spaced, horizontal array of dots while the order of conditions was reversed for other subjects. In experiments 3 and 4, subjects were tested without the contact lens/spectacle combination. In experiment 3, subjects were tested in the absence and then in the presence of a regularly spaced, horizontal arrays of dots. In experiment 4, subjects were tested in the absence and then in the presence of a thin horizontal line. RESULTS: In experiment 1, in the absence of the array of dots, subjects undershot targets with the contact lens/spectacle combination. When the array was present, pointing with the contact lens/spectacle combination was accurate. In experiment 2, subjects undershot targets in the absence of the array of dots if this condition was performed first. If the array was present in the initial condition, the pointing undershoot in the second condition (array absent) was reduced. In all cases, the pointing undershoot was reduced in the presence of the array. In experiments 3 and 4, a pointing overshoot was found in the presence of an array of dots or a thin line. CONCLUSIONS: It is concluded that extraretinal eye position information is not the primary determinant of visuomotor localization in the presence of a horizontal contour. The overshoot produced by a horizontal contour may be related to a length illusion brought about by spatial filtering in the visual system or inaccurate distance judgments. |
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Authors:
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N Fogt; J Ortman |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) Volume: 21 ISSN: 0275-5408 ISO Abbreviation: Ophthalmic Physiol Opt Publication Date: 2001 May |
Date Detail:
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Created Date: 2001-06-08 Completed Date: 2001-06-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8208839 Medline TA: Ophthalmic Physiol Opt Country: England |
Other Details:
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Languages: eng Pagination: 206-16 Citation Subset: IM |
Affiliation:
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Ohio State University College of Optometry, 338 West Tenth Avenue, Columbus, OH 43210, USA. nfogt@optometry.ohio-state.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Accommodation, Ocular
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physiology Adult Analysis of Variance Dark Adaptation / physiology Eyeglasses / adverse effects Fixation, Ocular / physiology* Humans Myopia / physiopathology Perceptual Distortion / physiology* Refractive Errors / physiopathology Regression Analysis |
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