Anomalous Perception of Extrafoveal Motion

Perception ◽  
1982 ◽  
Vol 11 (3) ◽  
pp. 359-360 ◽  
Author(s):  
Donald M MacKay
Keyword(s):  
Perceived Motion

Experiments are reported in which the perceived motion of an extrafoveal grating slowed down to zero and that of an extrafoveal sector disc became fragmented upon prolonged fixation.

A new technique for estimating chromatic isoluminance in humans and monkeys

1990 ◽  
Vol 5 (6) ◽  
pp. 605-608 ◽  
Author(s):  
Avi Chaudhuri ◽  
Thomas D. Albright
Keyword(s):  
New Technique ◽  
Luminance Ratio ◽  
Optokinetic Response ◽  
Moving Stimulus ◽  
Perceptual Judgement ◽  
A New Technique ◽  
Perceived Motion

AbstractCurrent approaches to the problem of equating different colors for luminance (chromatic isoluminance) rely upon human reports of perceptual events that are reduced at some luminance ratio. In this report, a technique is described that evokes a vivid percept of motion of a textured pattern only at isoluminance. Furthermore, in both humans and monkeys, the moving stimulus produces a striking optokinetic response in the same direction as the perceived motion. If used in this manner, the technique can provide an estimate of chromatic isoluminance in a variety of species and be used to corroborate a human subjects's perceptual judgement.

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 Perceived motion in orientational afterimages: direction and speed

2001 ◽  
Vol 41 (2) ◽  
pp. 161-172 ◽  
Author(s):  
Gregory Francis ◽  
Hyungjun Kim
Keyword(s):  
Perceived Motion

A General Correspondence Approach to Apparent Motion

Perception ◽  
1993 ◽  
Vol 22 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Terry Caelli ◽  
Mark Manning ◽  
David Finlay
Keyword(s):  
Apparent Motion ◽  
Constraint Satisfaction ◽  
General Framework ◽  
Feature Weights ◽  
General Correspondence ◽  
Perceived Motion

A general framework is considered for how different features of image parts determine the perceived direction of apparent motion between these parts as a function of their internalized feature weights. It is shown how the compatibility and constraints between pairwise part correspondences also play important roles in the types of perceived motion between parts; this process is modelled via a multivariate constraint-satisfaction procedure.

Measurement of Perceived Motion In a Fixed Base Simulator

2016 ◽  
Author(s):  
Surya V. Chivukula ◽  
Frank M. Cardullo ◽  
Kirill B. Zaychik ◽  
Ahmad Q. Momani
Keyword(s):  
Fixed Base ◽  
Perceived Motion

Gradients Account for the Thresholds for Perceiving Motion and Depth in Observer-Produced Parallax Displays

Perception ◽  
2019 ◽  
Vol 48 (4) ◽  
pp. 338-345
Author(s):  
Soyogu Matsushita ◽  
Hiroshi Ono
Keyword(s):  
Depth Perception ◽  
Motion Parallax ◽  
Angular Separation ◽  
Disparity Gradient ◽  
Lower Depth ◽  
Perceived Motion

We examined whether the thresholds of motion and depth perception produced by motion parallax could be specified by the concept of a disparity gradient. We manipulated both the motion parallax amplitude and the angular separation of two dots and calculated the percentages of trials in which participants perceived motion or depth. The results showed that the amplitude of motion parallax for the threshold increased as the separation became larger with the gradients of 0.023, 0.072, and 0.430 for the lower depth, the lower motion, and the upper depth thresholds, respectively. These findings indicate that the gradient is a useful concept to specify the motion and depth thresholds together rather than parallax amplitude alone.

Can Illusory Motion Disrupt Tracking Real Motion?

Perception ◽  
1997 ◽  
Vol 26 (3) ◽  
pp. 269-275 ◽  
Author(s):  
Timothy J Andrews ◽  
Allison N McCoy
Keyword(s):  
Motion Perception ◽  
Retinal Image ◽  
Optokinetic Nystagmus ◽  
Neural Representation ◽  
Illusory Motion ◽  
Brain Areas ◽  
Critical Rate ◽  
Real Motion ◽  
Actual Motion ◽  
Perceived Motion

When rotating stripes or other periodic stimuli cross the retina at a critical rate, a reversal in the direction of motion of the stimuli is often seen. This illusion of motion perception was used to explore the roles of retinal and perceived motion in the generation of optokinetic nystagmus. Here we show that optokinetic nystagmus is disrupted during the perception of this illusion. Thus, when perceived and actual motion are in conflict, subjects fail to track the veridical movement. This observation suggests that the perception of motion can directly influence optokinetic nystagmus, even in the presence of a moving retinal image. A conflict in the neural representation of motion in different brain areas may explain these findings.

scholarly journals Attenuation of perceived motion smear during the vestibulo-ocular reflex

2005 ◽  
Vol 45 (16) ◽  
pp. 2191-2200 ◽  
Author(s):  
Harold E. Bedell ◽  
Saumil S. Patel
Keyword(s):  
Ocular Reflex ◽  
Vestibulo Ocular Reflex ◽  
Perceived Motion
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