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| Research article summary (published 30 Aug 2003): |
Grouping local directional signals into moving contours.
Full Abstract
We consider how local motion signals are combined to represent the movements of spatially extensive objects. A series of band-pass target dots, whose collective motion defined a moving contour, was positioned within a field of randomly moving noise dots. The visibility of the contours did not depend on the direction of movement relative to local contour orientation unless the contour was constrained to pass through fixation, suggesting that a previously reported advantage for collinear motion trajectories depends on the probability of detecting any of the target elements rather than the integrated contour. Contour visibility was invariant of the spatial frequency of the elements, but it did depend on the speed, number and spacing of elements defining it, as well as the angle and spatial frequency difference between adjacent elements. Local averaging of directional signals is not sufficient to explain these results. The visibility of these moving contours identifies narrow-band grouping processes that are sensitive to the shape defined by the directions of the elements forming the contour.
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Author information
Author/s: Bex, Peter J (PJ); Simmers, Anita J (AJ); Dakin, Steven C (SC);
Affiliation: Institute of Ophthalmology, 11-43 Bath Street, EC1V 9EL, London, UK. p.bex@ucl.ac.uk
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Vision research (Vision Res), published in England. (Language: eng)
Reference: 2003-Sep; vol 43 (issue 20) : pp 2141-53
Dates: Created 2003/07/11; Completed 2003/09/16; Revised 2006/11/15;
PMID: 12855250, 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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