| Are direction and speed coded independently by the visual system? Evidence from visual search. | |
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MedLine Citation:
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PMID: 1633133 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Three visual search experiments examined whether motion is coded as two separate features, speed and direction. Increasing the heterogeneity of the directions in which stimuli moved disrupted detection of a target defined by speed (fast among medium and slow nontargets), suggesting that speed is coded integrally with direction. However, heterogeneity in speed did not disrupt detection of a target moving in a particular direction among nontargets with different directions. This suggests that direction is coded independently of speed. The apparent paradox raised by these contrasting conclusions is consistent with neurophysiological and computational models of motion-detection, which suggest that low-levels of the visual system contain direction-detectors insensitive to speed, while speed is coded at higher levels by detectors which are also sensitive to direction. Evidence consistent with the existence of the latter conjunction detectors was obtained in a final experiment which found search for a conjunction of speed and direction to be parallel. |
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Authors:
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J Driver; P McLeod; Z Dienes |
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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: Spatial vision Volume: 6 ISSN: 0169-1015 ISO Abbreviation: Spat Vis Publication Date: 1992 |
Date Detail:
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Created Date: 1992-08-24 Completed Date: 1992-08-24 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8602662 Medline TA: Spat Vis Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 133-47 Citation Subset: IM; S |
Affiliation:
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Department of Experimental Psychology, University of Cambridge, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Form Perception / physiology Humans Middle Aged Motion Perception / physiology* Vision, Ocular / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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