scholarly journals Motion strength is not what is summed in the vector summation computation of plaid motion

2010 ◽  
Vol 6 (6) ◽  
pp. 1046-1046
Author(s):  
D. Liu ◽  
G. Sperling
Keyword(s):  
Plaid Motion

scholarly journals Monocular mechanisms determine plaid motion coherence

1996 ◽  
Vol 13 (4) ◽  
pp. 615-626 ◽  
Author(s):  
David Alais ◽  
Maarten J. van der Smagt ◽  
Frans A. J. Verstraten ◽  
W. A. van de Grind
Keyword(s):  
Cortical Area ◽  
The Other ◽  
Coherent Motion ◽  
Spatial Period ◽  
Two Dimensional ◽  
Middle Temporal ◽  
Spatial Frequencies ◽  
Motion Coherence ◽  
Plaid Motion ◽  
Feature Based

AbstractAlthough the neural location of the plaid motion coherence process is not precisely known, the middle temporal (MT) cortical area has been proposed as a likely candidate. This claim rests largely on the neurophysiological findings showing that in response to plaid stimuli, a subgroup of cells in area MT responds to the pattern direction, whereas cells in area V1 respond only to the directions of the component gratings. In Experiment 1, we report that the coherent motion of a plaid pattern can be completely abolished following adaptation to a grating which moves in the plaid direction and has the same spatial period as the plaid features (the so-called “blobs”). Interestingly, we find this phenomenon is monocular: monocular adaptation destroys plaid coherence in the exposed eye but leaves it unaffected in the other eye. Experiment 2 demonstrates that adaptation to a purely binocular (dichoptic) grating does not affect perceived plaid coherence. These data suggest several conclusions: (1) that the mechanism determining plaid coherence responds to the motion of plaid features, (2) that the coherence mechanism is monocular, and thus (3), that it is probably located at a relatively low level in the visual system and peripherally to the binocular mechanisms commonly presumed to underlie two-dimensional (2-D) motion perception. Experiment 3 examines the spatial tuning of the monocular coherence mechanism and our results suggest it is broadly tuned with a preference for lower spatial frequencies. In Experiment 4, we examine whether perceived plaid direction is determined by the motion of the grating components or the features. Our data strongly support a feature-based model.

scholarly journals Illusory position shift induced by plaid motion

2009 ◽  
Vol 49 (24) ◽  
pp. 2902-2910 ◽  
Author(s):  
Rumi Hisakata ◽  
Ikuya Murakami
Keyword(s):  
Plaid Motion ◽  
Position Shift

scholarly journals Perceived direction of plaid motion is not predicted by component speeds

2007 ◽  
Vol 47 (3) ◽  
pp. 375-383 ◽  
Author(s):  
Rebecca A. Champion ◽  
Stephen T. Hammett ◽  
Peter G. Thompson
Keyword(s):  
Plaid Motion

scholarly journals Pigeons integrate visual motion signals differently than humans

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yuya Hataji ◽  
Hika Kuroshima ◽  
Kazuo Fujita
Keyword(s):  
Comparative Studies ◽  
Visual Motion ◽  
Ecological Factors ◽  
Motion Integration ◽  
Primate Brain ◽  
Two Component ◽  
Plaid Motion

Abstract Perceiving motion is a fundamental ability for animals. Primates integrate local 1D motion across orientation and space to compute a rigid 2D motion. It is unknown whether the rule of 2D motion integration is universal within the vertebrate clade; comparative studies of animals with different ecological backgrounds from primates may help answer that question. Here we investigated 2D motion integration in pigeons, using hierarchically structured motion stimuli, namely a barber-pole illusion and plaid motion. The pigeons were trained to report the direction of motion of random dots. When a barber-pole or plaid stimulus was presented, they reported the direction perpendicular to the grating orientation for barber-pole and the vector average of two component gratings for plaid motion. These results demonstrate that pigeons perceive different directions than humans from the same motion stimuli, and suggest that the 2D integrating rules in the primate brain has been elaborated through phylogenetic or ecological factors specific to the clade.

scholarly journals The Barberplaid Illusion: Plaid Motion is Biased by Elongated Apertures

1996 ◽  
Vol 36 (19) ◽  
pp. 3061-3075 ◽  
Author(s):  
BRENT R. BEUTTER ◽  
JEFFREY B. MULLIGAN ◽  
LELAND S. STONE
Keyword(s):  
Plaid Motion

Integration and segregation of multiple motion signals by neurons in area MT of primate

2014 ◽  
Vol 111 (2) ◽  
pp. 369-378 ◽  
Author(s):  
J. Scott McDonald ◽  
Colin W. G. Clifford ◽  
Selina S. Solomon ◽  
Spencer C. Chen ◽  
Samuel G. Solomon
Keyword(s):  
Single Unit ◽  
Multielectrode Arrays ◽  
Single Unit Recording ◽  
Population Response ◽  
Unit Recording ◽  
Temporal Area ◽  
Middle Temporal ◽  
Transparent Motion ◽  
Response Profile ◽  
Plaid Motion

We used multielectrode arrays to measure the response of populations of neurons in primate middle temporal area to the transparent motion of two superimposed dot fields moving in different directions. The shape of the population response was well predicted by the sum of the responses to the constituent fields. However, the population response profile for transparent dot fields was similar to that for coherent plaid motion and hence an unreliable cue to transparency. We then used single-unit recording to characterize component and pattern cells from their response to drifting plaids. Unlike for plaids, component cells responded to the average direction of superimposed dot fields, whereas pattern cells could signal the constituent motions. This observation provides support for a strong prediction of the Simoncelli and Heeger (1998) model of motion analysis in area middle temporal, and suggests that pattern cells have a special status in the processing of superimposed dot fields.

scholarly journals Illusory position shift induced by plaid motion

2010 ◽  
Vol 9 (8) ◽  
pp. 689-689
Author(s):  
R. Hisakata ◽  
I. Murakami
Keyword(s):  
Plaid Motion ◽  
Position Shift

Two-Dimensional Tilt Illusions Induced by Orthogonal Plaid Patterns: Effects of Plaid Motion, Orientation, Spatial Separation, and Spatial Frequency

Perception ◽  
1989 ◽  
Vol 18 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Peter Wenderoth ◽  
Syren Johnstone ◽  
Rick Van der Zwan
Keyword(s):  
Spatial Frequency ◽  
Real Line ◽  
Repeated Measures ◽  
Spatial Separation ◽  
Frequency Condition ◽  
Angular Function ◽  
Frame Effect ◽  
Tilt Illusion ◽  
Plaid Motion ◽  
Axes Of Symmetry

Tilt illusions occur when a drifting vertical test grating is surrounded by a drifting plaid pattern composed of orthogonal moving gratings. The angular function of this illusion was measured as the plaid orientation (and therefore its drift direction) varied over a 180° range, This was done when the test and inducing stimuli abutted and had the same spatial frequency, and when the test and inducing stimuli either differed in frequency by an octave, or were spatially separated by a 2 deg blank annulus, or both differed in frequency and were also separated by the annulus (experiments 1–4). The obtained angular function was virtually identical to that obtained previously with the rod and frame effect and other cases involving orthogonal inducing components, with evidence for illusions induced both by real-line components and by virtual axes of symmetry. Although the magnitude of the illusion was very similar in all four experiments, there was evidence to suggest that largest real-line effects occurred in the abutting same-frequency condition, with a pattern of results similar to that obtained previously with the simple one-dimensional tilt illusion. On the other hand, virtual-axis effects were more prominent with gaps between test and inducing stimuli. A fifth, repeated-measures, experiment confirmed this pattern of results. It is suggested that this pattern-induced tilt effect reflects both striate and extrastriate mechanisms and that the apparent influence of spatially distal virtual axes of symmetry upon perceived orientation implies the existence of AND-gate mechanisms, or conjunction detectors, in the orientation domain.

scholarly journals Two paradigms of bistable plaid motion reveal independent mutual inhibition processes

2019 ◽  
Vol 19 (4) ◽  
pp. 5
Author(s):  
Jean-Michel Hupé ◽  
Camilo Miguel Signorelli ◽  
David Alais
Keyword(s):  
Mutual Inhibition ◽  
Plaid Motion
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