Seeing multiple directions of motion—physiology and psychophysics

Dot patterns sliding transparently across one another are normally perceived as independently moving surfaces. Recordings from direction-selective neurons in area MT of the macaque suggested that this perceptual segregation did not depend on the presence of two peaks in the population activity. Rather, the visual system seemed to use overall shape of the population response to determine the number and directions of motion components. This approach explained a number of perceptual phenomena, including susceptibility of the motion system to direction metamers, motion patterns combining three or five directions incorrectly perceived by subjects as comprising only two directions. Our findings offer insights into the coding of multi-valued sensory signals and provide constraints for biologically based computational models.

[1]  R. Wurtz,et al.  Responses of MT and MST neurons to one and two moving objects in the receptive field. , 1997, Journal of neurophysiology.

[2]  Frans A. J. Verstraten,et al.  A new transparent motion aftereffect , 1999, Nature Neuroscience.

[3]  T. Albright.  Direction and orientation selectivity of neurons in visual area MT of the macaque. , 1984, Journal of neurophysiology.

[4]  Stefan Treue,et al.  Revisiting motion repulsion: evidence for a general phenomenon? , 1999, Vision Research.

[5]  John H. R. Maunsell,et al.  Functional properties of neurons in middle temporal visual area of the macaque monkey. II. Binocular interactions and sensitivity to binocular disparity. , 1983, Journal of neurophysiology.

[6]  Alexandre Pouget,et al.  Probabilistic Interpretation of Population Codes , 1996, Neural Computation.

[7]  A. Pouget,et al.  Reading population codes: a neural implementation of ideal observers , 1999, Nature Neuroscience.

[8]  Robert Sekuler,et al.  Using metamers to explore motion perception , 1991, Vision Research.

[9]  J. E. Albano,et al.  The role of directionally selective neurons in the perception of global motion , 1990, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[10]  Michael I. Jordan,et al.  Advances in Neural Information Processing Systems 30 , 1995 .

[11]  Erika E. Fanselow,et al.  Behavioral Modulation of Tactile Responses in the Rat Somatosensory System , 1999, The Journal of Neuroscience.

[12]  Eero P. Simoncelli,et al.  A model of neuronal responses in visual area MT , 1998, Vision Research.

[13]  S. Watamaniuk.  Ideal observer for discrimination of the global direction of dynamic random-dot stimuli. , 1993, Journal of the Optical Society of America. A, Optics and image science.

[14]  B Moulden,et al.  A Simultaneous Shift in Apparent Direction: Further Evidence for a “Distribution-Shift” Model of Direction Coding , 1980, The Quarterly journal of experimental psychology.

[15]  C D Salzman,et al.  Neural mechanisms for forming a perceptual decision. , 1994, Science.

[16]  T. Albright,et al.  Image Segmentation Enhances Discrimination of Motion in Visual Noise , 1997, Vision Research.

[17]  K. Hoffmann,et al.  Continuous mapping of direction selectivity in the cat's visual cortex , 1976, Neuroscience Letters.

[18]  M. Graziano,et al.  Tuning of MST neurons to spiral motions , 1994, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[19]  R. Andersen,et al.  Integration of motion and stereopsis in middle temporal cortical area of macaques , 1995, Nature.

[20]  Robert Sekuler,et al.  Coherent global motion percepts from stochastic local motions , 1984, Vision Research.

[21]  O. Braddick,et al.  Integration across Directions in Dynamic Random Dot Displays: Vector Summation or Winner Take All? , 1996, Vision Research.

[22]  M. Lings,et al.  Articles , 1967, Soil Science Society of America Journal.

[23]  Frans A. J. Verstraten,et al.  Movement aftereffect of bi-vectorial transparent motion , 1994, Vision Research.

[24]  A. Rosenfeld,et al.  Perceptual motion transparency : the role of geometrical information , 1992 .

[25]  O Braddick,et al.  Local and Global Representations of Velocity: Transparency, Opponency, and Global Direction Perception , 1997, Perception.

[26]  J. Maunsell,et al.  Effects of Attention on the Processing of Motion in Macaque Middle Temporal and Medial Superior Temporal Visual Cortical Areas , 1999, The Journal of Neuroscience.

[27]  W T Newsome,et al.  Tuning bandwidths for near-threshold stimuli in area MT. , 1998, Journal of neurophysiology.

[28]  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.

[29]  Frans A. J. Verstraten,et al.  Responses of Complex Cells in Area 17 of the Cat to Bi-vectorial Transparent Motion , 1996, Vision Research.

[30]  H R Wilson,et al.  A model for motion coherence and transparency , 1994, Visual Neuroscience.

[31]  R. Sekuler,et al.  Mutual repulsion between moving visual targets. , 1979, Science.

[32]  G. DeAngelis,et al.  Cortical area MT and the perception of stereoscopic depth , 1998, Nature.

[33]  T D Albright,et al.  Segmentation by Color Influences Responses of Motion-Sensitive Neurons in the Cortical Middle Temporal Visual Area , 1999, The Journal of Neuroscience.

[34]  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.

[35]  S. Zeki.  The distribution of wavelength and orientation selective cells in different areas of monkey visual cortex , 1983, Proceedings of the Royal Society of London. Series B. Biological Sciences.

[36]  Andrew P. Duchon,et al.  The human visual system averages speed information , 1992, Vision Research.

[37]  Alexander Grunewald,et al.  Orthogonal motion after-effect illusion predicted by a model of cortical motion processing , 1996, Nature.