Dichoptic motion perception limited to depth of fixation?

When counterphase spatio-temporal flicker is presented to the left and right eye continuous directional motion can be perceived. Here, we investigate whether this type of dichoptic motion can be observed at different depth planes. Four observers indicated direction of motion for dichoptic motion stimuli, presented in a context containing crossed and uncrossed disparity information in different conditions. Our results show that despite the presence of disparity cues in the stimulus, discrimination of motion direction remained maximal at interocular phase offsets that correspond to binocular motion perception at zero disparity. This constraint brings into question perception of dichoptic motion as the result of an early binocular motion system. We compared our results with predictions of a computational stereo-motion model [Qian, N. (1994). Computing stereo disparity and motion with known binocular cell properties. Neural Computations, 6, 390-404; Qian, N., & Andersen, R. A. (1997). A physiological model for motion-stereo integration and a unified explanation of Pulfrich-like phenomena. Vision Research, 37, 1683-1698]. In contrast to our empirical results, simulations of cell activation in this hybrid energy model predict maximal activation at non-zero disparities. It is concluded that perception of dichoptic motion is a by-product of early interocular combination at low contrasts rather than the result of a dedicated stereo-motion system.

[1]  Farid I Kandil,et al.  Mechanisms of time‐based figure–ground segregation , 2003, The European journal of neuroscience.

[2]  Mark A. Georgeson,et al.  No evidence for dichoptic motion sensing: a reply to carney and shadlen , 1992, Vision Research.

[3]  A. Derrington,et al.  Temporal resolution of dichoptic and second-order motion mechanisms , 1998, Vision Research.

[4]  N. Qian,et al.  A Physiological Model for Motion-Stereo Integration and a Unified Explanation of Pulfrich-like Phenomena , 1997, Vision Research.

[5]  C. Schor,et al.  Spatial tuning of static and dynamic local stereopsis , 1984, Vision Research.

[6]  R A Andersen,et al.  Transparent motion perception as detection of unbalanced motion signals. III. Modeling , 1994, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[7]  Margaret S. Livingstone,et al.  Two-Dimensional Substructure of Stereo and Motion Interactions in Macaque Visual Cortex , 2003, Neuron.

[8]  Z L Lu,et al.  Three-systems theory of human visual motion perception: review and update. , 2001, Journal of the Optical Society of America. A, Optics, image science, and vision.

[9]  Izumi Ohzawa,et al.  Joint-encoding of motion and depth by visual cortical neurons: neural basis of the Pulfrich effect , 2001, Nature Neuroscience.

[10]  Marisa Carrasco,et al.  Sustained attention enhances letter identification without affecting channel tuning , 2004 .

[11]  Michael N. Shadlen,et al.  Binocularity of early motion mechanisms: Comments on Georgeson and Shackleton , 1992, Vision Research.

[12]  George Sperling,et al.  A gain-control theory of binocular combination. , 2006, Proceedings of the National Academy of Sciences of the United States of America.

[13]  Martin Lages.  Bayesian models of binocular 3-D motion perception. , 2006, Journal of vision.

[14]  C W Tyler,et al.  Stereoscopic Depth Movement: Two Eyes Less Sensitive than One , 1971, Science.

[15]  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.

[16]  D G Pelli,et al.  The VideoToolbox software for visual psychophysics: transforming numbers into movies. , 1997, Spatial vision.

[17]  Bruce G Cumming,et al.  Effect of interocular delay on disparity-selective v1 neurons: relationship to stereoacuity and the pulfrich effect. , 2005, Journal of neurophysiology.

[18]  Preeti Verghese,et al.  What is the depth of a sinusoidal grating? , 2004, Journal of vision.

[19]  Ning Qian,et al.  Computing Stereo Disparity and Motion with Known Binocular Cell Properties , 1994, Neural Computation.

[20]  G. Sperling,et al.  The functional architecture of human visual motion perception , 1995, Vision Research.

[21]  R A Andersen,et al.  Transparent motion perception as detection of unbalanced motion signals. I. Psychophysics , 1994, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[22]  Michael N. Shadlen,et al.  Dichoptic activation of the early motion system , 1993, Vision Research.

[23]  M. Georgeson,et al.  Feature matching and segmentation in motion perception , 1999, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[24]  Mark A. Georgeson,et al.  Monocular motion sensing, binocular motion perception , 1989, Vision Research.

[25]  Eugene Switkes,et al.  Parallel processing of motion and colour information , 1987, Nature.

[26]  M. Shadlen,et al.  Mechanisms of human motion perception revealed by a new cyclopean illusion. , 1986, Science.

[27]  P. Mamassian,et al.  Spatial and temporal tuning of motion in depth , 2003, Vision Research.

[28]  Y Chen,et al.  Modeling V1 disparity tuning to time-varying stimuli. , 2001, Journal of neurophysiology.

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

[30]  Pulfrich-like Phenomena,et al.  A Physiological Model for Motion-Stereo Integration and a Unified Explanation of , 1997 .

[31]  B. G. Cumming,et al.  Binocular mechanisms for detecting motion-in-depth , 1994, Vision Research.

[32]  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.

[33]  C. Tyler,et al.  Failure of rivalry at low contrast: Evidence of a suprathreshold binocular summation process , 1992, Vision Research.

[34]  D H Brainard,et al.  The Psychophysics Toolbox. , 1997, Spatial vision.

[35]  M. J. Morgan,et al.  Motion-stereo mechanisms sensitive to inter-ocular phase , 2000, Vision Research.