Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8795409 | Vision Research | 2016 | 12 Pages |
Abstract
The magnitude of the Poggendorff bias in perceived collinearity was measured with a 2AFC task and roving pedestal, and was found to be in the region of 6-8Â deg, within the range of previous estimates. Further measurements dissected the bias into several components: (1) The small (â¼1Â deg) repulsion of the orientation of the pointer from the parallel, probably localized in the part of the line near the intersection (2) A small (<1Â deg) location bias affecting the intersection of pointers and inducing lines; and (3) A larger (>1Â deg) bias in the orientation of virtual lines crossing the gap between two parallels, towards the orientation of the parallels, or equivalently (4) An orthogonal bias in actively constructing a virtual line across the gap. We conclude that orientation repulsion by itself is an inadequate explanation of the Poggendorff effect, and that a full explanation must take account of the way in which observers construct virtual lines in visual space in order to carry out elementary geometrical tasks such as extrapolation.
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Sensory Systems
Authors
Michael Morgan, Barbara Dillenburger,