| Is global motion really based on spatial integration of local motion signals? | |
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MedLine Citation:
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PMID: 7975281 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies have shown that a random-dot kinematogram (RDK) comprising dots, each of which takes a random walk in direction or speed over time, can appear to flow in a single direction. This has been interpreted as evidence for the existence of a co-operative network linking neurons sensitive to different directions/speeds and different spatial locations. We have investigated the possibility that global motion perception in such patterns might simply reflect motion energy detection at a coarse spatial scale (such that many dots fall in the receptive field of one energy detector) without the need to encode local dot motions on a fine spatial scale and then integrate their motions over space. We created random-walk RDKs and then spatially high-pass filtered them to remove low spatial frequencies. Perception of global motion was unimpaired for both direction and speed random walks, showing that the phenomenon is not reliant on low spatial frequencies and must, therefore, involve integration of local motion signals across space, as originally postulated. |
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Authors:
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A T Smith; R J Snowden; A B Milne |
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: 34 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1994 Sep |
Date Detail:
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Created Date: 1994-12-09 Completed Date: 1994-12-09 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: 2425-30 Citation Subset: IM; S |
Affiliation:
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Vision Research Unit, School of Psychology, University of Wales College of Cardiff. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Discrimination (Psychology)
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physiology Humans Motion Perception / physiology* Pattern Recognition, Visual / physiology* Psychometrics Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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