Increased Motion Linking Across Edges with Decreased Luminance Contrast, Edge Width and Duration

Accurate interpretations of image require the segmentation of motion signals produced by different objects with the simultaneous integration of motion signals produced by the same object. We investigated a motion integration paradigm in which the direction of an object's motion could only be determined from an integration of motion signals across the disconnected object edges. In a series of experiments we show that observers' ability to determine object motion depends significantly upon stimulus duration, luminance contrast and edge width. These effects suggest that the visual system, after some delay, relies upon relatively thick, luminance defined contour discontinuities to segment moving images.

[1]  K. Nakayama,et al.  Occlusion and the solution to the aperture problem for motion , 1989, Vision Research.

[2]  Tom Troscianko,et al.  Perception of random-dot symmetry and apparent movement at and near isoluminance , 1987, Vision Research.

[3]  P. Lennie,et al.  Chromatic mechanisms in lateral geniculate nucleus of macaque. , 1984, The Journal of physiology.

[4]  D. Hubel,et al.  Segregation of form, color, movement, and depth: anatomy, physiology, and perception. , 1988, Science.

[5]  P. Lennie,et al.  Chromatic mechanisms in striate cortex of macaque , 1990, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[6]  Delwin T. Lindsey,et al.  Motion at isoluminance: Discrimination/ detection ratios for moving isoluminant gratings , 1990, Vision Research.

[7]  Nikos K. Logothetis,et al.  Parallel pathways in the visual system: Their role in perception at isoluminance , 1991, Neuropsychologia.

[8]  Maggie Shiffrar,et al.  Motion integration across differing image features , 1995, Vision Research.

[9]  M. Shiffrar,et al.  Different motion sensitive units are involved in recovering the direction of moving lines , 1993, Vision Research.

[10]  Maggie Shiffrar,et al.  The influence of terminators on motion integration across space , 1992, Vision Research.

[11]  H. Cunningham,et al.  Percepts of rigid motion within and across apertures. , 1991, Journal of experimental psychology. Human perception and performance.

[12]  H. Wilson,et al.  A psychophysically motivated model for two-dimensional motion perception , 1992, Visual Neuroscience.

[13]  Hugh R. Wilson,et al.  Perceived direction of moving two-dimensional patterns depends on duration, contrast and eccentricity , 1992, Vision Research.

[14]  O. Braddick Segmentation versus integration in visual motion processing , 1993, Trends in Neurosciences.

[15]  N. Logothetis,et al.  Perceptual deficits and the activity of the color-opponent and broad-band pathways at isoluminance. , 1990, Science.

[16]  John H. R. Maunsell,et al.  How parallel are the primate visual pathways? , 1993, Annual review of neuroscience.

[17]  DH Hubel,et al.  Psychophysical evidence for separate channels for the perception of form, color, movement, and depth , 1987, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[18]  E. Adelson,et al.  Phenomenal coherence of moving visual patterns , 1982, Nature.

[19]  Ellen C. Hildreth,et al.  Measurement of Visual Motion , 1984 .

[20]  J. Pokorny,et al.  Spectral sensitivity of the foveal cone photopigments between 400 and 500 nm , 1975, Vision Research.

[21]  Sylvia Weir,et al.  Action perception , 1974 .

[22]  Hans Wallach Über visuell wahrgenommene Bewegungsrichtung , 1935 .

[23]  M. Shiffrar,et al.  Perceived speed of moving lines depends on orientation, length, speed and luminance , 1993, Vision Research.

[24]  J. Krauskopf,et al.  Influence of colour on the perception of coherent motion , 1990, Nature.

[25]  S. Ullman The interpretation of structure from motion , 1979, Proceedings of the Royal Society of London. Series B. Biological Sciences.

[26]  Edward H Adelson,et al.  The perception of coherent motion in two-dimensional patterns (abstract only) , 1984, COMG.

[27]  T. Albright,et al.  Image Segmentation Cues in Motion Processing: Implications for Modularity in Vision , 1993, Journal of Cognitive Neuroscience.

[28]  A. Derrington,et al.  Discriminating the direction of second-order motion at short stimulus durations , 1993, Vision Research.

[29]  K. Mullen The contrast sensitivity of human colour vision to red‐green and blue‐yellow chromatic gratings. , 1985, The Journal of physiology.

[30]  V. S. Ramachandran,et al.  Perceptual organization in moving patterns , 1983, Nature.

[31]  R Shapley,et al.  Visual sensitivity and parallel retinocortical channels. , 1990, Annual review of psychology.

[32]  F. Kooi Local direction of edge motion causes and abolishes the barberpole illusion , 1993, Vision Research.