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Perception, 1998, volume 27, pages 1287-1304 Temporal aspects of slant and inclination perception

Summary: Perception, 1998, volume 27, pages 1287-1304
Temporal aspects of slant and inclination perception
Robert S Allison, Ian P Howard
Centre for Vision Research, 103 Farquharson Building, York University, North York, Ontario M3J 1P3,
Canada; e-mail: allison@hpl.crestech.ca; ihoward@hpl.crestech.ca
Brian J Rogers, Holly Bridge
Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford 0X1 3UD, UK;
e-mail: BJR@psy.ox.ac.uk; holly.bridge@physiol.ox.ac.uk
Paper presented at the Applied Vision Association Conference/Workshop on Depth Perception,
Guildford, Surrey, UK, 4 September 1997; revised version received 8 July 1998
Abstract. Linear transformations (shear or scale transformations) of either horizontal or vertical
disparity give rise to the percept of slant or inclination. It has been proposed that the percept
of slant induced by vertical size disparity, known as Ogle's induced-size effect, and the analogous
induced-shear effect, compensate for scale and shear distortions arising from aniseikonia,
eccentric viewing, and cyclodisparity. We hypothesised that these linear transformations of vertical
disparity are processed more slowly than equivalent transformations of horizontal disparity (hori-
zontal shear and size disparity). We studied the temporal properties of the stereoscopic slant and
inclination percepts that arose when subjects viewed stereograms with various combinations of
horizontal and vertical size or shear disparities. We found no evidence to support our hypothesis.
There were no clear differences in the build-up of percepts of slant or inclination induced by step


Source: Allison, Robert - Department of Computer Science, York University (Toronto)


Collections: Computer Technologies and Information Sciences; Biology and Medicine