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| Research article summary (published 30 Mar 2002): |
Comparison of the spatial-frequency selectivity of local and global motion detectors.
Full Abstract
Convergent physiological and behavioral evidence indicates that the initial receptive fields responsible for motion detection are spatially localized. Consequently, the perception of global patterns of movement (such as expansion) requires that the output of these local mechanisms be integrated across visual space. We have differentiated local and global motion processes, with mixtures of coherent and incoherent moving patterns composed of bandpass filtered dots, and have measured their spatial-frequency selectivity. We report that local motion detectors show narrow-band spatial-frequency tuning (i.e., they respond only to a narrow range of spatial frequencies) but that global motion detectors show broadband spatial-frequency tuning (i.e., they integrate across a broad range of spatial frequencies), with a preference for low spatial frequencies.
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Author information
Author/s: Bex, Peter J (PJ); Dakin, Steven C (SC);
Affiliation: Institute of Ophthalmology, London, UK. p.bex(-atsign-)ucl.ac.uk
Journal and publication information
Publication Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't
Journal: Journal of the Optical Society of America. A, Optics, image science, and vision (J Opt Soc Am A Opt Image Sci Vis), published in United States. (Language: eng)
Reference: 2002-Apr; vol 19 (issue 4) : pp 670-7
Dates: Created 2002/04/05; Completed 2002/04/23; Revised 2006/11/15;
PMID: 11934159, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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