| What spatial frequency do we use to detect the orientation of a Landolt C? | |
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MedLine Citation:
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PMID: 9327062 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We calculated the two-dimensional Fourier spectrum of a Landolt C. For Landolt Cs of orthogonal orientation, the main differences in the amplitude spectrum were found at a low frequency such that 1.3 periods were equal to the size fo the Landolt C, rather than at the high frequency corresponding to the size of the gap, i.e., such that 2.5 periods were equal to the size of the Landolt C. We compared visual acuity assessments obtained with Landolt C optotypes and the cut-off of the contrast sensitivity function measured with sinusoidal gratings. We found that the frequency corresponding to the size of the gap is twice the latter frequency. We suggest that, in fact, this lower frequency can be used to determine the position of the gap. |
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Authors:
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V M Bondarko; M V Danilova |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Vision research Volume: 37 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1997 Aug |
Date Detail:
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Created Date: 1997-10-27 Completed Date: 1997-10-27 Revised Date: 2006-11-15 |
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: 2153-6 Citation Subset: IM |
Affiliation:
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Laboratory for Vision Physiology, I. P. Pavlov Institute of Physiology, St. Petersburg, Russia. lera@vbond.usr.pu.ru |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Fourier Analysis Humans Pattern Recognition, Visual / physiology Rotation* Space Perception / physiology* Vision Tests* Visual Acuity* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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