Does Segregation by Colour/Luminance Facilitate the Detection of Structure-from-Motion in Noise?

Li, Hyung-Chul O.; Kingdom, Frederick A. A.

doi:10.1068/p270769

Cited by 8 publications

(8 citation statements)

References 23 publications

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“…Our results complement a number of previous findings exploring the role of color vision in texture-processing 21 22 and in other types of figure-ground relationship, such as the detection of global motion 15 23 24 25 26 27 28 29 , and stereoscopic targets embedded in multiple-depth distractors 30 . All these studies failed to find evidence for color-specific channels mediating the particular motion/form/depth task.…”

Section: Discussionsupporting

confidence: 87%

The role of color and attention-to-color in mirror-symmetry perception

Gheorghiu

Kingdom

Remkes

et al. 2016

Sci Rep

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The role of color in the visual perception of mirror-symmetry is controversial. Some reports support the existence of color-selective mirror-symmetry channels, others that mirror-symmetry perception is merely sensitive to color-correlations across the symmetry axis. Here we test between the two ideas. Stimuli consisted of colored Gaussian-blobs arranged either mirror-symmetrically or quasi-randomly. We used four arrangements: (1) ‘segregated’ – symmetric blobs were of one color, random blobs of the other color(s); (2) ‘random-segregated’ – as above but with the symmetric color randomly selected on each trial; (3) ‘non-segregated’ – symmetric blobs were of all colors in equal proportions, as were the random blobs; (4) ‘anti-symmetric’ – symmetric blobs were of opposite-color across the symmetry axis. We found: (a) near-chance levels for the anti-symmetric condition, suggesting that symmetry perception is sensitive to color-correlations across the symmetry axis; (b) similar performance for random-segregated and non-segregated conditions, giving no support to the idea that mirror-symmetry is color selective; (c) highest performance for the color-segregated condition, but only when the observer knew beforehand the symmetry color, suggesting that symmetry detection benefits from color-based attention. We conclude that mirror-symmetry detection mechanisms, while sensitive to color-correlations across the symmetry axis and subject to the benefits of attention-to-color, are not color selective.

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Section: Discussionsupporting

confidence: 87%

The role of color and attention-to-color in mirror-symmetry perception

Gheorghiu

Kingdom

Remkes

et al. 2016

Sci Rep

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“…First, local estimates of velocity are obtained within small areas of the image and these in turn are combined in a second stage in order to compute global aspects of the optic £ow within larger regions of the image. Interestingly, cross-cue interactions do not in general appear to be useful in the discrimination of direction in global motion stimuli, which are composed of`signal' elements that move in a speci¢c direction and`noise' elements that move in random directions (Edwards & Badcock 1994, 1996Oli & Kingdom 1998;Snowden & Rossiter 1999). The perception of coherent motion in such stimuli requires the spatial integration of motion estimates from signal dots across the image.…”

Section: Discussionmentioning

confidence: 99%

Cue combination in the motion correspondence problem

Hibbard

Bradshaw

Eagle

2000

Proc. R. Soc. Lond. B

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Image motion is a primary source of visual information about the world. However, before this information can be used the visual system must determine the spatio-temporal displacements of the features in the dynamic retinal image, which originate from objects moving in space. This is known as the motion correspondence problem. We investigated whether cross-cue matching constraints contribute to the solution of this problem, which would be consistent with physiological reports that many directionally selective cells in the visual cortex also respond to additional visual cues. We measured the maximum displacement limit (D max ) for two-frame apparent motion sequences. D max increases as the number of elements in such sequences decreases. However, in our displays the total number of elements was kept constant while the number of a subset of elements, de¢ned by a di¡erence in contrast polarity, binocular disparity or colour, was varied. D max increased as the number of elements distinguished by a particular cue was decreased. D max was a¡ected by contrast polarity for all observers, but only some observers were in£uenced by binocular disparity and others by colour information. These results demonstrate that the human visual system exploits local, cross-cue matching constraints in the solution of the motion correspondence problem.

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“…The three studies (Cavanagh et al, 1995;Li & Kingdom, 1998;Wuerger & Landy, 1993) that investigated the chromatic input to depth from motion found a significant color contribution. In the structure-frommotion task, purely chromatic stimuli always yielded above-chance per formance, and per formance improved with increasing chromatic contrast (Li & Kingdom, 1998;Wuerger & Landy, 1993). The stimulus in one of the SFM tasks (Wuerger & Landy, 1993) was a 66 -degree field of small blurred blobs with a cutoff frequency at 2 cpd, moving at a speed ranging from 0.6 to 4 degrees/s with an average speed of about 1.6 degrees/s.…”

Section: Structure From Motion and Motion Parallaxmentioning

confidence: 99%

The Perception of Motion in Chromatic Stimuli

Cropper

Wuerger

2005

Behavioral and Cognitive Neuroscience Reviews

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The issue of whether there is a motion mechanism sensitive to purely chromatic stimuli has been pertinent for the past 30 or more years. The aim of this review is to examine why such different conclusions have been drawn in the literature and to reach some reconciliation. The review critically examines the behavioral evidence and concludes that there is a purely chromatic motion mechanism but that it is limited to the fovea. Examination of motion performance for chromatic and luminance stimuli provides convincing evidence that there are at least two different mechanisms for the two kinds of stimuli. The authors further argue that the chromatic mechanism may be at a particular disadvantage when the integration of multiple local motion signals is required. Finally, the authors present a descriptive model that may go some way toward explaining the reasons for the differences in collected data outlined in this article.

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Does Segregation by Colour/Luminance Facilitate the Detection of Structure-from-Motion in Noise?

Cited by 8 publications

References 23 publications

The role of color and attention-to-color in mirror-symmetry perception

The role of color and attention-to-color in mirror-symmetry perception

Cue combination in the motion correspondence problem

The Perception of Motion in Chromatic Stimuli

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