Surface Discontinuity is Critical in a Moving Observer's Perception of Objects’ Depth Order and Relative Motion from Retinal Image Motion

Perception ◽  
1998 ◽  
Vol 27 (10) ◽  
pp. 1153-1176 ◽  
Author(s):  
Michiteru Kitazaki ◽  
Shinsuke Shimojo
Keyword(s):  
Visual System ◽  
Relative Motion ◽  
Retinal Image ◽  
Object Motion ◽  
Image Motion ◽  
Depth Order ◽  
Velocity Discontinuity ◽  
Retinal Image Motion ◽  
Surface Discontinuity ◽  
Self Motion

The visual system perceptually decomposes retinal image motion into three basic components that are ecologically significant for the human observer: object depth, object motion, and self motion. Using this conceptual framework, we explored the relationship between them by examining perception of objects’ depth order and relative motion during self motion. We found that the visual system obeyed what we call the parallax-sign constraint, but in different ways depending on whether the retinal image motion contained velocity discontinuity or not. When velocity discontinuity existed (eg in dynamic occlusion, transparent motion), the subject perceptually interpreted image motion as relative motion between surfaces with stable depth order. When velocity discontinuity did not exist, he/she perceived depth-order reversal but no relative motion. The results suggest that the existence of surface discontinuity or of multiple surfaces indexed by velocity discontinuity inhibits the reversal of global depth order.

scholarly journals Glossiness Perception Enhanced by Retinal-Image Motion from Object-Motion and Self-Motion

i-Perception ◽  
10.1068/ic366 ◽  
2011 ◽  
Vol 2 (4) ◽  
pp. 366-366 ◽  
Author(s):  
Keisuke Araki ◽  
Masaya Kato ◽  
Takehiro Nagai ◽  
Kowa Koida ◽  
Shigeki Nakauchi ◽  
...  
Keyword(s):  
Retinal Image ◽  
Object Motion ◽  
Image Motion ◽  
Retinal Image Motion ◽  
Self Motion

‘Generic-View Principle’ for Three-Dimensional-Motion Perception: Optics and Inverse Optics of a Moving Straight Bar

Perception ◽  
1996 ◽  
Vol 25 (7) ◽  
pp. 797-814 ◽  
Author(s):  
Michiteru Kitazaki ◽  
Shinsuke Shimojo
Keyword(s):  
Visual System ◽  
Motion Perception ◽  
Retinal Image ◽  
General Framework ◽  
Three Dimensional ◽  
Image Motion ◽  
Optical Process ◽  
Retinal Image Motion ◽  
The Subject ◽  
Three Components

The generic-view principle (GVP) states that given a 2-D image the visual system interprets it as a generic view of a 3-D scene when possible. The GVP was applied to 3-D-motion perception to show how the visual system decomposes retinal image motion into three components of 3-D motion: stretch/shrinkage, rotation, and translation. First, the optical process of retinal image motion was analyzed, and predictions were made based on the GVP in the inverse-optical process. Then experiments were conducted in which the subject judged perception of stretch/shrinkage, rotation in depth, and translation in depth for a moving bar stimulus. Retinal-image parameters—2-D stretch/shrinkage, 2-D rotation, and 2-D translation—were manipulated categorically and exhaustively. The results were highly consistent with the predictions. The GVP seems to offer a broad and general framework for understanding the ambiguity-solving process in motion perception. Its relationship to other constraints such as that of rigidity is discussed.

scholarly journals A simple approach to ignoring irrelevant variables by population decoding based on multisensory neurons

2016 ◽  
Vol 116 (3) ◽  
pp. 1449-1467 ◽  
Author(s):  
HyungGoo R. Kim ◽  
Xaq Pitkow ◽  
Dora E. Angelaki ◽  
Gregory C. DeAngelis
Keyword(s):  
Intrinsic Noise ◽  
Object Motion ◽  
Image Motion ◽  
Cue Integration ◽  
Learning Mechanisms ◽  
Optimal Linear ◽  
Retinal Image Motion ◽  
Heading Estimation ◽  
Task Irrelevant ◽  
Self Motion

Sensory input reflects events that occur in the environment, but multiple events may be confounded in sensory signals. For example, under many natural viewing conditions, retinal image motion reflects some combination of self-motion and movement of objects in the world. To estimate one stimulus event and ignore others, the brain can perform marginalization operations, but the neural bases of these operations are poorly understood. Using computational modeling, we examine how multisensory signals may be processed to estimate the direction of self-motion (i.e., heading) and to marginalize out effects of object motion. Multisensory neurons represent heading based on both visual and vestibular inputs and come in two basic types: “congruent” and “opposite” cells. Congruent cells have matched heading tuning for visual and vestibular cues and have been linked to perceptual benefits of cue integration during heading discrimination. Opposite cells have mismatched visual and vestibular heading preferences and are ill-suited for cue integration. We show that decoding a mixed population of congruent and opposite cells substantially reduces errors in heading estimation caused by object motion. In addition, we present a general formulation of an optimal linear decoding scheme that approximates marginalization and can be implemented biologically by simple reinforcement learning mechanisms. We also show that neural response correlations induced by task-irrelevant variables may greatly exceed intrinsic noise correlations. Overall, our findings suggest a general computational strategy by which neurons with mismatched tuning for two different sensory cues may be decoded to perform marginalization operations that dissociate possible causes of sensory inputs.

scholarly journals Effects of retinal-image motion of specular highlights induced by object motion and manual control on glossiness perception.

2013 ◽  
Vol 13 (9) ◽  
pp. 204-204 ◽  
Author(s):  
T. Uehara ◽  
Y. Tani ◽  
T. Nagai ◽  
K. Koida ◽  
S. Nakauchi ◽  
...  
Keyword(s):  
Retinal Image ◽  
Object Motion ◽  
Image Motion ◽  
Manual Control ◽  
Retinal Image Motion ◽  
Specular Highlights

Retinal and Extraretinal Information in Movement Perception: How to Invert the Filehne Illusion

Perception ◽  
1987 ◽  
Vol 16 (3) ◽  
pp. 299-308 ◽  
Author(s):  
Alexander H Wertheim
Keyword(s):  
Eye Movements ◽  
Visual System ◽  
Reference Signal ◽  
Stimulus Presentation ◽  
Image Motion ◽  
Spatial Frequencies ◽  
Extraretinal Signal ◽  
Retinal Image Motion ◽  
Induced Motion ◽  
Self Motion

During a pursuit eye movement made in darkness across a small stationary stimulus, the stimulus is perceived as moving in the opposite direction to the eyes. This so-called Filehne illusion is usually explained by assuming that during pursuit eye movements the extraretinal signal (which informs the visual system about eye velocity so that retinal image motion can be interpreted) falls short. A study is reported in which the concept of an extraretinal signal is replaced by the concept of a reference signal, which serves to inform the visual system about the velocity of the retinae in space. Reference signals are evoked in response to eye movements, but also in response to any stimulation that may yield a sensation of self-motion, because during self-motion the retinae also move in space. Optokinetic stimulation should therefore affect reference signal size. To test this prediction the Filehne illusion was investigated with stimuli of different optokinetic potentials. As predicted, with briefly presented stimuli (no optokinetic potential) the usual illusion always occurred. With longer stimulus presentation times the magnitude of the illusion was reduced when the spatial frequency of the stimulus was reduced (increased optokinetic potential). At very low spatial frequencies (strongest optokinetic potential) the illusion was inverted. The significance of the conclusion, that reference signal size increases with increasing optokinetic stimulus potential, is discussed. It appears to explain many visual illusions, such as the movement aftereffect and center–surround induced motion, and it may bridge the gap between direct Gibsonian and indirect inferential theories of motion perception.

Retinal Image Motion During Deliberate Fixation

2000 ◽  
Vol 78 (2) ◽  
pp. 131-142 ◽  
Author(s):  
James W. Ness ◽  
Harry Zwick ◽  
Bruce E. Stuck ◽  
David J. Lurid ◽  
Brian J. Lurid ◽  
...  
Keyword(s):  
Retinal Image ◽  
Image Motion ◽  
Retinal Image Motion

Apparent Depth with Retinal Image Motion of Expansion and Contraction Yoked to Head Movement

Perception ◽  
1998 ◽  
Vol 27 (8) ◽  
pp. 937-949 ◽  
Author(s):  
Takanao Yajima ◽  
Hiroyasu Ujike ◽  
Keiji Uchikawa
Keyword(s):  
Motion Parallax ◽  
Ccd Camera ◽  
Head Movements ◽  
Image Motion ◽  
Apparent Depth ◽  
Motion Cues ◽  
Relative Expansion ◽  
Retinal Image Motion ◽  
Self Motion

The two main questions addressed in this study were (a) what effect does yoking the relative expansion and contraction (EC) of retinal images to forward and backward head movements have on the resultant magnitude and stability of perceived depth, and (b) how does this relative EC image motion interact with the depth cues of motion parallax? Relative EC image motion was produced by moving a small CCD camera toward and away from the stimulus, two random-dot surfaces separated in depth, in synchrony with the observers' forward and backward head movements. Observers viewed the stimuli monocularly, on a helmet-mounted display, while moving their heads at various velocities, including zero velocity. The results showed that (a) the magnitude of perceived depth was smaller with smaller head velocities (<10 cm s−1), including the zero-head-velocity condition, than with a larger velocity (10 cm s−1), and (b) perceived depth, when motion parallax and the EC image motion cues were simultaneously presented, is equal to the greater of the two possible perceived depths produced from either of these two cues alone. The results suggested the role of nonvisual information of self-motion on perceiving depth.

Visual Coherence Affects Smooth Pursuit

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 10-10
Author(s):  
B R Beutter ◽  
J Lorenceau ◽  
L S Stone
Keyword(s):  
Object Motion ◽  
Image Motion ◽  
High Luminance ◽  
Perceptual Effect ◽  
Low Contrast ◽  
Line Segments ◽  
Motion Signal ◽  
Contrast Condition ◽  
Retinal Image Motion ◽  
Moving Line

For four subjects (one naive), we measured pursuit of a line-figure diamond moving along an elliptical path behind an invisible X-shaped aperture under two conditions. The diamond's corners were occluded and only four moving line segments were visible over the background (38 cd m−2). At low segment luminance (44 cd m−2), the percept is largely a coherently moving diamond. At high luminance (108 cd m−2), the percept is largely four independently moving segments. Along with this perceptual effect, there were parallel changes in pursuit. In the low-contrast condition, pursuit was more related to object motion. A \chi2 analysis showed ( p>0.05) that for 98% of trials subjects were more likely tracking the object than the segments, for 29% of trials one could not reject the hypothesis that subjects were tracking the object and not the segments, and for 100% of trials one could reject the hypothesis that subjects were tracking the segments and not the object. Conversely, in the high-contrast condition, pursuit appeared more related to segment motion. For 66% of trials subjects were more likely tracking the segments than the object; for 94% of trials one could reject the hypothesis that subjects were tracking the object and not the segments; and for 13% of trials one could not reject the hypothesis that subjects were tracking the segments and not the object. These results suggest that pursuit is driven by the same object-motion signal as perception, rather than by simple retinal image motion.

Sign in / Sign up

Export Citation Format

Share Document