| The time it takes to detect changes in speed and direction of visual motion. | |
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MedLine Citation:
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PMID: 12120628 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied the ability of human observers to detect abrupt changes in velocity of motion of a random dot pattern. The pattern moved horizontally for 0.9 s at velocity V0, then changed to V1 either in speed, or in direction for a time T and returned to the initial motion. The threshold duration for detection of the change was measured for initial speeds of 2, 4, 8 and 16 deg/s. The time to detect a velocity reversal was equal to that for detection of an increase in speed by a factor of three. The time to detect an abrupt cessation of motion was equal to the time for detection of an increase in speed by a factor of two. The time to detect a direction change, the speed being constant, decreased gradually with increasing angle between V0 and V1 from 12 to 180 degrees and with increasing V0; the detection time was a function of (V1-V0) almost independent of the value of V0. This finding supports the hypothesis of Dzhafarov et al. (Percept Psychophys 1993;54:373-750), that the visual system effectively reduces the detection of velocity changes (from V0 to V1) to the presumably more simple detection of a motion onset, from 0 to (V1-V0). The characteristics of the detection process in the cases of uni- and two-dimensional velocity changes are discussed. |
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Authors:
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J Hohnsbein; S Mateeff |
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Publication Detail:
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Type: Comparative Study; 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 Sep |
Date Detail:
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Created Date: 2002-07-15 Completed Date: 2002-08-30 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: 2569-73 Citation Subset: IM |
Affiliation:
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Institut für Arbeitsphysiologie, Universität Dortmund, Ardeystr. 67, D-44139 Dortmund, Germany. hohnsbein@arb-phys.uni-dortmund.de |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Humans Motion Perception / physiology* Psychophysics Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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