Motion and metacontrast with simultaneous onset of stimuli.

Coherent directional motion can be seen if an image is displayed in two sequential frames (F1 and F2), where F2 is a translated version of F1. A similar two-frame sequence can produce metacontrast masking: the visibility of a leading target (F1) is reduced by a trailing, spatially nonoverlapping mask (F2). Strict temporal succession of the stimuli has been considered essential for both motion and masking. This requirement for a minimum stimulus-onset asynchrony (SOA) is known as the SOA law. Contrary to the SOA law, we found that motion and masking can be obtained with simultaneous onsets of the stimuli, provided that F2 outlasts F1. We compared motion and metacontrast with simultaneous onsets of the stimuli (SIM paradigm) with the traditional paradigm in which an interstimulus interval (ISI) is inserted between the leading and the trailing stimuli (ISI paradigm). We studied the effects in light-adapted and in dark-adapted viewing, each over a wide range of stimulus intensities. Homologous results were obtained with the two paradigms, thus disconfirming the SOA law. Models of motion sensors, such as that proposed by Reichardt [in Sensory Communication, W. A. Rosenblith, ed. (MIT Press, Cambridge, Mass., 1961), p. 303], are inherently capable of explaining the motion results obtained with both paradigms. The masking results with the SIM paradigm disconfirm theories based on onset-locked slow excitatory and fast inhibitory responses but can be explained in terms of Bridgeman's network model [Bull. Math. Biol. 40, 605 (1978)]. In light of the results obtained with the two paradigms, we discuss, and tentatively support, the suggestion that motion and metacontrast may be complementary parts of a unitary perceptual system.

[1]  O. Braddick.  The masking of apparent motion in random-dot patterns. , 1973, Vision research.

[2]  E. Matín,et al.  The two-transient (masking) paradigm. , 1975, Psychological review.

[3]  H. Barlow,et al.  Dark adaptation, absolute threshold and purkinje shift in single units of the cat's retina , 1957, The Journal of physiology.

[4]  D. H. Kelly.  Theory of flicker and transient responses. I. Uniform fields. , 1971, Journal of the Optical Society of America.

[5]  D. Jameson,et al.  Mach bands : quantitative studies on neural networks in the retina , 1966 .

[6]  William R. Uttal,et al.  A taxonomy of visual processes , 1981 .

[7]  V. Lollo,et al.  Perception of directional sampled motion in relation to displacement and spatial frequency: Evidence for a unitary motion system , 1990, Vision Research.

[8]  P. Cavanagh,et al.  Motion: the long and short of it. , 1989, Spatial vision.

[9]  D. H. Kelly.  Theory of flicker and transient responses. II. Counterphase gratings. , 1971, Journal of the Optical Society of America.

[10]  N Weisstein,et al.  A Rashevsky-Landahl neural net: simulation of metacontrast. , 1968, Psychological review.

[11]  Donald C. Hood,et al.  Sensitivity to Light , 1986 .

[12]  G. Békésy.  Mach- and hering-type lateral inhibition in vision , 1968 .

[13]  M. A. Bouman,et al.  Spatiotemporal modulation transfer in the human eye. , 1967, Journal of the Optical Society of America.

[14]  P. H. Schiller,et al.  A comparison of forward and backward masking , 1965 .

[15]  D. Burr,et al.  Seeing objects in motion , 1986, Proceedings of the Royal Society of London. Series B. Biological Sciences.

[16]  Edward E. Smith,et al.  Effect of Luminance Ratio on Masking , 1962 .

[17]  G. Sperling.  The description and luminous calibration of cathode ray oscilloscope visual displays , 1971 .

[18]  D. Kahneman.  Method, findings, and theory in studies of visual masking. , 1968, Psychological bulletin.

[19]  A. Stoper,et al.  Relation of split apparent motion to metacontrast. , 1977, Journal of experimental psychology. Human perception and performance.

[20]  V. Lollo,et al.  Equating the brightness of brief visual stimuli of unequal durations , 1986 .

[21]  A. Reeves.  Pathways in Type-B (U-Shaped) Metacontrast , 1986, Perception.

[22]  M. J. Morgan,et al.  Conditions for motion flow in dynamic visual noise , 1980, Vision Research.

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

[24]  E H Adelson,et al.  Spatiotemporal energy models for the perception of motion. , 1985, Journal of the Optical Society of America. A, Optics and image science.

[25]  M. M. Hayhoe,et al.  Spatial interactions and models of adaptation , 1990, Vision Research.

[26]  V. Lollo,et al.  Effects of adapting luminance and stimulus contrast on the temporal and spatial limits of short-range motion , 1990, Vision Research.

[27]  B G Breitmeyer,et al.  Implications of sustained and transient channels for theories of visual pattern masking, saccadic suppression, and information processing. , 1976, Psychological review.

[28]  Naomi Weisstein,et al.  Apparent movement and metacontrast: A note on Kahneman’s formulation , 1969 .

[29]  H. Werner.  Studies on Contour: I. Qualitative Analyses , 1935 .

[30]  Joyce E. Farrell,et al.  The visible persistence of stimuli in stroboscopic motion , 1990, Vision Research.

[31]  M M Sondhi,et al.  Model for visual luminance discrimination and flicker detection. , 1968, Journal of the Optical Society of America.

[32]  R. M. Boynton,et al.  Negative flashes, positive flashes, and flicker examined by increment threshold technique. , 1965, Journal of the Optical Society of America.

[33]  B. Breitmeyer,et al.  Contour suppression during stroboscopic motion and metacontrast. , 1974, Vision research.

[34]  E. Fehrer.  Effect of stimulus similarity on retroactive masking. , 1966, Journal of experimental psychology.

[35]  C W Eriksen,et al.  Some temporal characteristics of visual pattern perception. , 1967, Journal of experimental psychology.

[36]  V. Lollo.  Temporal integration in visual memory. , 1980 .

[37]  P. A. Kolers.  Aspects of motion perception , 1972 .

[38]  Peter Dixon,et al.  Temporal integration and segregation of brief visual stimuli: Patterns of correlation in time , 1994, Perception & psychophysics.

[39]  D. Burr,et al.  Summation of Target and Mask Metacontrast Stimuli , 1984, Perception.

[40]  B. Bridgeman.  Metacontrast and lateral inhibition. , 1971, Psychological review.

[41]  Walter F. Bischof,et al.  Stimulus-Onset Asynchrony Is Not Necessary for Motion Perception or Metacontrast Masking , 1993 .

[42]  Walter F. Bischof,et al.  On the confounding effects of phosphor persistence in oscilloscopic displays , 1993, Vision Research.

[43]  G. Sperling,et al.  Drift-balanced random stimuli: a general basis for studying non-Fourier motion perception. , 1988, Journal of the Optical Society of America. A, Optics and image science.

[44]  Bruno G. Breitmeyer,et al.  On the role of stroboscopic motion in metacontrast , 1981 .

[45]  O J Braddick,et al.  Low-level and high-level processes in apparent motion. , 1980, Philosophical transactions of the Royal Society of London. Series B, Biological sciences.

[46]  Bruce Bridgeman,et al.  Distributed sensory coding applied to simulations of iconic storage and metacontrast , 1978 .

[47]  D. Kahneman.  An onset-onset law for one case of apparent motion and metacontrast , 1967 .

[48]  J. van Santen,et al.  Elaborated Reichardt detectors. , 1985, Journal of the Optical Society of America. A, Optics and image science.

[49]  R M BOYNTON,et al.  Visual responses to equally bright stimuli of unequal luminance. , 1962, Journal of the Optical Society of America.

[50]  Naomi Weisstein,et al.  The effect of perceived depth and connectedness on metacontrast functions , 1984, Vision Research.

[51]  Gary Finley,et al.  A high-speed point plotter for vision research , 1985, Vision Research.

[52]  Mitsuo Ikeda,et al.  Temporal Summation of Positive and Negative Flashes in the Visual System , 1965 .

[53]  F. Campbell,et al.  The influence of spatial frequency and contrast on the perception of moving patterns , 1981, Vision Research.

[54]  M. Hayhoe,et al.  The time-course of multiplicative and subtractive adaptation process , 1987, Vision Research.

[55]  Hugo Maes,et al.  Visual cortical correlates of visible persistence , 1985, Vision Research.

[56]  Bruno G. Breitmeyer,et al.  Visual masking : an integrative approach , 1984 .

[57]  O. Braddick.  A short-range process in apparent motion. , 1974, Vision research.

[58]  V. Lollo,et al.  Beyond Visible Persistence: An Alternative Account of Temporal Integration and Segregation in Visual Processing , 1994, Cognitive Psychology.

[59]  B G Breitmeyer,et al.  Backward masking by pattern stimulus offset. , 1981, Journal of experimental psychology. Human perception and performance.

[60]  Y. Galifret,et al.  A psychophysical study of the visual perception of “instantaneous” and “durable” , 1977, Vision Research.