Volume 7, Number 12, Article 13, Pages 1-9 doi:10.1167/7.12.13 http://journalofvision.org/7/12/13/ ISSN 1534-7362
Dynamics of snakes and ladders
Keith A. May
McGill Vision Research Unit, Department of Ophthalmology, McGill University, Montréal, Québec, Canada
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Robert F. Hess
McGill Vision Research Unit, Department of Ophthalmology, McGill University, Montréal, Québec, Canada
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Abstract

D. J. Field, A. Hayes, and R. F. Hess (1993) introduced two types of stimulus to study the perceptual integration of contours. Both types of stimulus consist of a smooth path of spatially separate elements, embedded in a field of randomly oriented elements. In one type of stimulus (“snakes”), the elements form tangents to the path of the contour; in the other type (“ladders”), the elements are orthogonal to the path. Little is currently known about the relative integration speeds of these two types of contour. We investigated this issue by temporally modulating the orientations of the contour elements. Our results suggest that snakes and ladders are integrated at similar speeds.

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History
Received October 30, 2006; published September 28, 2007
Citation
May, K. A., & Hess, R. F. (2007). Dynamics of snakes and ladders. Journal of Vision, 7(12):13, 1-9, http://journalofvision.org/7/12/13/, doi:10.1167/7.12.13.
Keywords
contour integration, temporal, speed, snakes, ladders
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