| Independent speed-tuned global-motion systems. | |
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MedLine Citation:
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PMID: 9747494 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Several experiments were conducted to investigate the role of speed in global-motion processing; the extraction of the direction of motion of a small subset of coherently-moving (signal) dots in a stimulus in which the other (noise) dots move in random directions. The specific aim of the experiments was to determine whether multiple speed-tuned global-motion systems exist. The results of these experiments are: (1) when the signal dots were chosen from a group of dots moving at 1.2 degrees s-1, the speed of additional-noise dots had to be below 4.8 degrees s-1 for them to affect global-motion extraction; (2) the addition of static dots did not impair the extraction of a global-motion signal carried by dots moving at 1.2 degrees s-1; (3) noise dots moving at 1.2 degrees s-1 impaired the extraction of a global-motion signal from dots moving at 10.8 degrees s-1, though not to the same extent as dots moving at a higher speed; and (4) these results were dependent upon speed, not spatial-step size or luminance contrast. These results are interpreted as indicating that global-motion extraction occurs within at least two independent speed tuned systems. One of these systems is sensitive to high speeds and the other to low speeds. |
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Authors:
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M Edwards; D R Badcock; A T Smith |
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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: Vision research Volume: 38 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1998 Jun |
Date Detail:
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Created Date: 1998-10-15 Completed Date: 1998-10-15 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: 1573-80 Citation Subset: IM; S |
Affiliation:
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Information Science Research Laboratory, NTT Basic Research Laboratories, Kanagawa, Japan. mark@hering.berkeley.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Humans Male Motion Perception / physiology* Pattern Recognition, Visual / physiology Sensory Thresholds / physiology Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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