| Detection of vorticity in optical flow fields. | |
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MedLine Citation:
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PMID: 8106914 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Psychophysical thresholds for the detection of vorticity in the presence of a translational component are determined for human observers. Stimuli consist of sparse random-dot flow patterns. The detection of vorticity depends critically on the translational component. The curvature of the flow lines, however, cannot be the only factor limiting human performance. On the basis of a comparison with an ideal detector, it is found that for small vorticities (< 0.5 rad/s) humans typically use the stimulus information in an optimal manner. For higher vorticities performance gets worse, possibly owing to matching problems. Lifetime and number of dots have hardly any influence on performance. Although this indicates that the human observer can already perform the task by using only local information, it does not imply that global information is disregarded. If the stimulus is disturbed locally, global information is used to full extent. |
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Authors:
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A M Kappers; A J van Doorn; J J Koenderink |
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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: Journal of the Optical Society of America. A, Optics, image science, and vision Volume: 11 ISSN: 1084-7529 ISO Abbreviation: J Opt Soc Am A Opt Image Sci Vis Publication Date: 1994 Jan |
Date Detail:
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Created Date: 1994-03-22 Completed Date: 1994-03-22 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9800943 Medline TA: J Opt Soc Am A Opt Image Sci Vis Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 48-54 Citation Subset: IM; S |
Affiliation:
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Utrecht Biophysics Research Institute, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Humans Psychophysics Sensory Thresholds / physiology Visual Fields* Visual Perception / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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