| Global-motion detection with transparent-motion signals. | |
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MedLine Citation:
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PMID: 10343805 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A number of experiments were conducted to compare the ability of observers to extract unidirectional and bidirectional (transparent) global-motion signals. In the unidirectional condition, the noise signal consisted of purely randomly-moving dots while in the bidirectional condition, a number of the randomly moving dots were replaced by the same number of dots moving in a specific (secondary-signal) direction. The threshold measure was the minimum number of signal dots required to determine the global-motion direction. For the bidirectional condition, parameters varied were the angular separation between the global-motion and secondary-signal directions and the strength of the secondary signal. Thresholds for unidirectional and bidirectional conditions were the same when the angular difference between global-motion and secondary-signal directions were 90 degrees or greater, i.e. the ability of observers to extract a transparent signal was the same as their ability to extract a unidirectional one. Similarly, with motion-in-depth signals, thresholds for extracting a centripetal signal were not elevated by replacing a number of the randomly-moving noise dots with the same number centrifugally-moving dots. The results are interpreted as indicating that motion signals moving between 90 and 180 degrees to the global-motion direction provide uniform masking of the global-motion signal. For angular separations less than 90 degrees, a suprathreshold secondary signal resulted in threshold elevation. This result could be due, to stronger inhibition from motion units tuned to similar (< 90 degrees) directions, broad directional-tuning of the underlying motion units (changing the task from signal detection to a signal discrimination) or a combination of the two. |
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Authors:
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M Edwards; S Nishida |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Vision research Volume: 39 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1999 Jun |
Date Detail:
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Created Date: 1999-06-14 Completed Date: 1999-06-14 Revised Date: 2004-11-17 |
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: 2239-49 Citation Subset: IM; S |
Affiliation:
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NTT Basic Research Laboratories, Information Science Research Laboratory, Kanagawa, Japan. mark@hering.berkeley.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Depth Perception
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physiology Humans Male Motion Perception / physiology* Pattern Recognition, Visual / physiology Psychophysics Sensory Thresholds / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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