scholarly journals Theory of the perceived motion direction of equal-spatial-frequency plaid stimuli.

2020 ◽  
Vol 127 (3) ◽  
pp. 305-326
Author(s):  
George Sperling ◽  
Peng Sun ◽  
Dantian Liu ◽  
Ling Lin
Keyword(s):  
Spatial Frequency ◽  
Motion Direction ◽  
Perceived Motion

scholarly journals Theoretical predictions of the perceived motion-direction of same-spatial-frequency plaids

2019 ◽  
Vol 19 (10) ◽  
pp. 167a
Author(s):  
George Sperling ◽  
Dantian T. Liu ◽  
Peng Sun ◽  
Ling Lin
Keyword(s):  
Spatial Frequency ◽  
Motion Direction ◽  
Theoretical Predictions ◽  
Perceived Motion

scholarly journals A new variant of the barberpole effect: Psychophysical data and computer simulations

Psihologija ◽  
2002 ◽  
Vol 35 (3-4) ◽  
pp. 209-223
Author(s):  
Dejan Todorovic
Keyword(s):  
Receptive Fields ◽  
Vertical Component ◽  
Parallel Line ◽  
Random Fluctuation ◽  
Final State ◽  
Motion Direction ◽  
Weak Preference ◽  
New Variant ◽  
Direction Sensitivity ◽  
Perceived Motion

The classic barberpole effect shows that perceived direction of motion of parallel line segments depends on the orientation of the frame defined by segment end points. A stimulus configuration was created by crossing two oblique barberpoles. Perceived motion in the crossed portion of the configuration is bi-stable, alternating between two oblique directions defined by the two component barberpoles. Ratings of dominance of perceived motion direction in the crossed portion of two barberpoles of different width and orientation revealed a strong preference for the wider component barberpole and a weak preference for the nearer-to-vertical component barberpole. A network model is presented in which each unit inhibits units with different direction sensitivity and co-extensive receptive fields, and excites units with equal direction sensitivity and neighboring receptive fields. Simulations of the temporal evolution of the spatial activity profile exhibit the effect of barberpole width and the bi-stability of percepts. Fatigue of highly adapted units enables the gradual emergence of non-adapted units. Small initial variations can lead to profound differences in the final state of the system, explaining the quasi-random fluctuation between the two perceptual variants.

scholarly journals Choice-induced biases in perception

2016 ◽  
Author(s):  
Long Luu ◽  
Alan A Stocker
Keyword(s):  
Discrimination Task ◽  
Sensory Information ◽  
Motion Direction ◽  
Great Opportunity ◽  
Perceptual Illusion ◽  
Psychophysical Data ◽  
Observer Model ◽  
Discrimination Judgment ◽  
Perceived Motion ◽  
The Brain

AbstractIllusions provide a great opportunity to study how perception is affected by both the observer's expectations and the way sensory information is represented1,2,3,4,5,6. Recently, Jazayeri and Movshon7 reported a new and interesting perceptual illusion, demonstrating that the perceived motion direction of a dynamic random dot stimulus is systematically biased when preceded by a motion discrimination judgment. The authors hypothesized that these biases emerge because the brain predominantly relies on those neurons that are most informative for solving the discrimination task8, but then is using the same neural weighting profile for generating the percept. In other words, they argue that these biases are “mistakes” of the brain, resulting from using inappropriate neural read-out weights. While we were able to replicate the illusion for a different visual stimulus (orientation), our new psychophysical data suggest that the above interpretation is likely incorrect: Biases are not caused by a read-out profile optimized for solving the discrimination task but rather by the specific choices subjects make in the discrimination task on any given trial. We formulate this idea as a conditioned Bayesian observer model and show that it can explain the new as well as the original psychophysical data. In this framework, the biases are not caused by mistake but rather by the brain's attempt to remain ‘self-consistent’ in its inference process. Our model establishes a direct connection between the current perceptual illusion and the well-known phenomena of cognitive consistency and dissonance9,10.

scholarly journals Seeing Global Motion in a Random Dot Image Sequence

i-Perception ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 204166952096110
Author(s):  
Chien-Chung Chen ◽  
Hiroshi Ashida ◽  
Xirui Yang ◽  
Pei-Yin Chen
Keyword(s):  
Random Walk ◽  
Image Sequence ◽  
Image Sequences ◽  
Spatial Context ◽  
Coherent Motion ◽  
Global Motion ◽  
Motion Direction ◽  
Motion Energy ◽  
Random Image ◽  
Perceived Motion

In a stimulus with multiple moving elements, an observer may perceive that the whole stimulus moves in unison if (a) one can associate an element in one frame with one in the next (correspondence) and (b) a sufficient proportion of correspondences signal a similar motion direction (coherence). We tested the necessity of these two conditions by asking the participants to rate the perceived intensity of linear, concentric, and radial motions for three types of stimuli: (a) random walk motion, in which the direction of each dot was randomly determined for each frame, (b) random image sequence, which was a set of uncorrelated random dot images presented in sequence, and (c) global motion, in which 35% of dots moved coherently. The participants perceived global motion not only in the global motion conditions but also in the random image sequences, though not in random walk motion. The type of perceived motion in the random image sequences depends on the spatial context of the stimuli. Thus, although there is neither a fixed correspondence across different frames nor a coherent motion direction, observers can still perceive global motion in the random image sequence. This result cannot be explained by motion energy or local aperture border effects.

Effect of Element Size on Stereoscopic Apparent Motion

2003 ◽  
Vol 96 (3_suppl) ◽  
pp. 1187-1193 ◽  
Author(s):  
Hiroyuki Ito
Keyword(s):  
Motion Perception ◽  
Apparent Motion ◽  
Forced Choice ◽  
Spatial Displacement ◽  
Motion Direction ◽  
Element Size ◽  
Random Dot Stereograms ◽  
Perceived Motion

Spatial displacement limits in stereoscopic (cyclopean) apparent motion were measured from sequentially presented two-frame random-depth configurations. Each depth configuration was defined by stereoscopically near or far elements of various sizes. The limits were compared with those in luminance-defined apparent motion. The subject's task was 2-alternative forced-choice of the perceived motion direction of the sequentially presented two-frame random-dot stereograms. The spatial displacement limit below which correct motion perception arose with stereoscopic configurations was larger in proportion to increases in size of elements. The values were almost consistent with those measured by luminance-defined configurations with the same element sizes. This result suggests that the strategy for discrimination of motion direction of random configurations is similar in both stereoscopic and luminance-defined apparent motion.

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