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dc.contributor.authorRuda, Haralden_US
dc.date.accessioned2011-11-14T19:07:51Z
dc.date.available2011-11-14T19:07:51Z
dc.date.issued1998-01
dc.identifier.urihttps://hdl.handle.net/2144/2339
dc.description.abstractBadcock & Westheimer (Spatial Vision, 1(1), 3-11, 1985) showed that a thin vertical line induces nearby zones of attraction and repulsion; this study extends those results by more closely examining the horizontal and vertical extents of the repulsion zone and by using an illusory contour to induce repulsion. The experimental paradigm measures perceived hyperacute displacements of a thin vertical line 10' tall. Halfway through the stimulus, the bright target line was shifted and a lower contrast flanking line added. Conditions equivalent to Badcock & Westheimer replicate their results. Repulsion is observed horizontally from separations of 5' to at least 30' and becomes minimal at 50'. Repulsion also decreases with increasing vertical separation. Another experiment shows that symmetry is not required for repulsion when the flanking line is split into two vertically separated fragments; one fragment alone causes the same amount of repulsion as both fragments together. Finally, it is shown that a flanking contour formed by the grating illusion causes repulsion of the target line in the same manner as a target line defined by luminance.en_US
dc.description.sponsorshipBritish Petroleum (89A-1204); Defense Advanced Research Projects Agency (90-0083); Air Force Office of Scientific Research (90-0175)en_US
dc.language.isoen_US
dc.publisherBoston University Center for Adaptive Systems and Department of Cognitive and Neural Systemsen_US
dc.relation.ispartofseriesBUCAS/CNS Technical Reports; BUCAS/CNS-TR-1998-005
dc.rightsCopyright 1998 Boston University. Permission to copy without fee all or part of this material is granted provided that: 1. The copies are not made or distributed for direct commercial advantage; 2. the report title, author, document number, and release date appear, and notice is given that copying is by permission of BOSTON UNIVERSITY TRUSTEES. To copy otherwise, or to republish, requires a fee and / or special permission.en_US
dc.titleThe Warped Geometry of Visual Space Near a Line Assessed Using a Hyperacuity Displacement Tasken_US
dc.typeTechnical Reporten_US
dc.rights.holderBoston University Trusteesen_US


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