Displacement limits for spatial frequency filtered random-dot cinematograms in apparent motion. 1983

J J Chang, and B Julesz

Two-dimensional band-pass filtered random-dot cinematograms were used to study apparent movement mediated by the short-range process. In the first experiment maximum displacement (dmax) for correct direction of movement was measured for symmetrically filtered low-pass, medium-pass, and high-pass images. dmax was found to be limited by the grain size in the image and increased with the target area. Since eccentric presentation had no effect on dmax, the increase of dmax with target area suggests that apparent movement perception is a global process. In the second experiment the stimulus was filtered differentially in the two orthogonal directions using cone filtering. dmax was found to be commensurate with the length of the clusters in the direction of the movement.

UI MeSH Term Description Entries
D009039 Motion Perception The real or apparent movement of objects through the visual field. Movement Perception,Perception, Motion,Perception, Movement
D009903 Optical Illusions An illusion of vision usually affecting spatial relations. Illusion, Optical,Illusions, Optical,Optical Illusion
D010364 Pattern Recognition, Visual Mental process to visually perceive a critical number of facts (the pattern), such as characters, shapes, displays, or designs. Recognition, Visual Pattern,Visual Pattern Recognition
D005556 Form Perception The sensory discrimination of a pattern, shape, or outline. Contour Perception,Contour Perceptions,Form Perceptions,Perception, Contour,Perception, Form,Perceptions, Contour,Perceptions, Form
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012399 Rotation Motion of an object in which either one or more points on a line are fixed. It is also the motion of a particle about a fixed point. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Clinorotation,Clinorotations,Rotations

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