Abstract
The continuous approach to optic-flow processing shows that the curvature of a moving surface is related to a second spatial derivative of the velocity field, the spin variation (Droulez & Cornilleau-Pérès, 1989).With this approach as a theoretical framework, visual sensitivity to the curvature of a cylinder in motion was measured using a task of discrimination between cylindrical and planar patches. The results confirm the predictions suggested by the theory: (1) Sensitivity to curvature was always greater when the cylinder axis and the frontal translation were parallel than when they were orthogonal. The ratio of curvature detection thresholds in the two cases was between 1.3 and 2.5; the value predicted from the spin variation theory is about 2. (2) Sensitivity to curvature increased strongly with the velocity of the motion but was only weakly affected by its amplitude and the duration of viewing for the range of values used in our experiments.
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This work was supported by Grant ATP/Communication from the Centre National de la Recherche Scientifique.
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Cornilleau-Pérès, V., Droulez, J. Visual perception of surface curvature: Psychophysics of curvature detection induced by motion parallax. Perception & Psychophysics 46, 351–364 (1989). https://doi.org/10.3758/BF03204989
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DOI: https://doi.org/10.3758/BF03204989