| The visual resolution of Landolt-C optotypes in human subjects depends on their orientation: the 'gap-down' effect. | |
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MedLine Citation:
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PMID: 11165766 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The visual resolution was measured in 184 healthy subjects using luminance contrast defined Landolt optotypes at eight different gap locations. The investigation used monocular detection for both eyes up to acuity thresholds. Acuity estimates were obtained under forced choice conditions and the threshold defined by a sensitive criterion. The results show that the percentage of correct responses was lowest when the gap of the Landolt-C was at 6 o'clock. There were no statistically significant differences between left vs. right or orthogonal vs. diagonal gap detection. Since anisotropic axes in orientation perception are not retinotopically mapped, we suggest the involvement of higher cortical mechanisms. |
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Authors:
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M Schrauf; C Stern |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Neuroscience letters Volume: 299 ISSN: 0304-3940 ISO Abbreviation: Neurosci. Lett. Publication Date: 2001 Feb |
Date Detail:
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Created Date: 2001-02-22 Completed Date: 2001-05-21 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 7600130 Medline TA: Neurosci Lett Country: Ireland |
Other Details:
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Languages: eng Pagination: 185-8 Citation Subset: IM |
Affiliation:
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Institute of Physiological Psychology, Heinrich-Heine-University, Duesseldorf, Universitätsstrasse 1, D-40225, Duesseldorf, Germany. schrauf@uni-duesseldorf.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Female Humans Male Neuropsychological Tests Orientation / physiology* Pattern Recognition, Visual / physiology* Photic Stimulation / methods* Space Perception / physiology* Visual Acuity / physiology* Visual Cortex / physiology Visual Pathways / physiology |
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