Interaction of stereo vision and optic flow processing revealed by an illusory stimulus

Vision Research
A Grigo, M Lappe

Abstract

The influence of stereoscopic vision on the perception of optic flow fields was investigated in experiments based on a recently described illusion. In this illusion, subjects perceive a shift of the center of an expanding optic flow field when it is transparently superimposed by a unidirectional motion pattern. This illusory shift can be explained by the visual system taking the presented flow pattern as a certain self-motion flow field. Here we examined the dependence of the illusory transformation on differences in depth between the two superimposed motion patterns. Presenting them with different relative binocular disparities, we found a strong variation in the magnitude of the illusory shift. Especially when translation was in front of expansion, a highly significant decrease of the illusory shift occurred, down to 25% of its magnitude at zero disparity. These findings confirm the assumption that the motion pattern is interpreted as a self-motion flow field. In a further experiment we presented monocular depth cues by changing dot size and dot density. This caused a reduction of the illusory shift which is distinctly smaller than under stereoscopic presentation. We conclude that the illusory optic flow transformation is mod...Continue Reading

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Citations

Mar 29, 2003·Neural Networks : the Official Journal of the International Neural Network Society·M Lappe, A Grigo
Aug 26, 1999·Trends in Cognitive Sciences·M Lappe van den Berg AV
Jun 26, 1999·The European Journal of Neuroscience·M Lappe, C J Duffy
Oct 8, 2003·Perception & Psychophysics·Hiroyuki Ito, Chisa Fujimoto
Jul 13, 2005·Vision Research·Jacob DuijnhouwerRichard J A van Wezel
Jul 5, 2005·Vision Research·Sieu K KhuuAnthony Hayes
Mar 12, 2015·Frontiers in Systems Neuroscience·David M ArnoldussenAlbert V van Den Berg
Oct 14, 2014·Frontiers in Human Neuroscience·Matthias Lich, Frank Bremmer
Sep 4, 1999·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·A Grigo, M Lappe
Dec 18, 2020·Proceedings of the National Academy of Sciences of the United States of America·Charlie S Burlingham, David J Heeger
Jan 20, 1999·Vision Research·C Pack, E Mingolla

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