Color and luminance share a common motion pathway

Cavanagh, Patrick; Favreau, Olga Eizner

doi:10.1016/0042-6989(85)90129-4

Cited by 125 publications

(48 citation statements)

References 16 publications

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“…~uiluminant colour gratings satisfy both these criteria, although they may not do so at contrasts close to the detection threshold. Equiluminant colour gratings give rise to a motion after-effect (Cavanagh & Favreau, 1985;Derrington & Badcock, 1985a;Mullen & Baker, 1985), and the motion after-effects elicited by luminance gratings can be nulled by colour gratings and vice versa (~r~ngton & Badcock, 1985a). The direction of motion of luminance gratings can be discriminated in exposures as short as 15 msec at contrasts 0.5 log units above threshold; whereas colour gratings require an exposure of 24Omsec at low contrasts, or a higher contrast in order to support direction-of-motion discrimination (Cropper & Derrington, 1990): the direction of motion of colour gratings can be discriminate at exposure durations of 30mse.c at contrasts 1.5 log units above threshold.…”

Section: Discussionmentioning

confidence: 99%

“…More recently it has been shown that moving colour patterns elicit percepts very similar to those elicited by moving luminance patterns, although the impression of motion they elicit may not be so robust: the apparent speed of moving colour gratings is lower than that of luminance gratings (Cavanagh et al, 1984), even to the point that adding colour to a luminance grating reduces its apparent speed of motion. However, prolonged viewing of equiIuminant coloured gratings induces a normal motion-after-effect (MAE) in the form of an impression of motion in the opposite direction to that of the pattern with has been viewed (Cavanagh & Favreau, 1985;Derrington & Badcock, 1985a;Mullen & Baker, 1985). Further, motion after-effects induced by equil~inant coloured gratings transfer to luminance gratings, and can be nulled by motion of the luminance grating in the opposite direction.…”

Section: Contribution Of Chromatic Mechanisms To Motion Sensitivitymentioning

confidence: 99%

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Detecting and discriminating the direction of motion of luminance and colour gratings

Derrington¹,

Henning

1993

Vision Research

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Human observers were required to discriminate the direction of motion of vertically moving, 1 c/deg luminance and colour gratings. The gratings had different contrasts and moved at temporal frequencies between 0.5 and 32 Hz. Sensitivity [the reciprocal of the contrast at which performance reached 75% correct in a temporal two-alternative forced-choice (2 AFC) discrimination task] was a band-pass function of temporal frequency for luminance gratings, and a low-pass function of temporal frequency for colour gratings. Further, when colour contrast was expressed in terms of the modulation in cone excitation produced by the stimulus, sensitivity to colour gratings was greater than sensitivity to luminance gratings at frequencies below 2 Hz. On the other hand, at temporal frequencies above 4 Hz, sensitivity to colour gratings was comparable with sensitivity to luminance gratings of double the temporal frequency. Research, 30, 1751-17611 who used a smaller stimulus seen in a parafoveal region and found that motion discrimination thresholds were higher than detection threshold for colour gratings. We repeated our threshold measurements using parafoveal viewing conditions similar to those used by Lindsey and Teller (1990). We found that, although for luminance gratings detection thresholds were very close to direction-discrimination thresholds, for colour gratings, they were lower. The result is in qualitative agreement with Lindsey and Teller (1990). Our results suggest that low-level, or "first-order" motion mechanisms are not as sensitive to chromatic gratings as are colour-detection mechanisms.

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Section: Discussionmentioning

confidence: 99%

Section: Contribution Of Chromatic Mechanisms To Motion Sensitivitymentioning

confidence: 99%

Detecting and discriminating the direction of motion of luminance and colour gratings

Derrington¹,

Henning

1993

Vision Research

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“…In general, motion perception is weaker at isoluminance than with luminance contrast present, but there is nevertheless good evidence for a chromatic input to at least some types of motion processing (Cavanagh & Favreau, 1985;Cropper & Derrington, 1996;Green, 1989;Morgan & Ingle, 1994;Mullen & Baker, 1985;Palmer, Mobley, & Teller, 1993;Papathomas, Gorea, & Julesz, 1991;Saito, Tanaka, Isono, Yasuda, & Mikami, 1989;Yoshizawa, Mullen, & Baker, 2000). That color might facilitate motion processing by helping segregate target elements from distractors is, however, not necessarily contingent on motion perception being possible at isoluminance.…”

mentioning

confidence: 91%

Segregation by color/luminance does not necessarily facilitate motion discrimination in the presence of motion distractors

Kingdom

2001

Perception & Psychophysics

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Under what circumstances is the common motion of a group of elements more easily perceived when the elements differ in color and/or luminance polarity from their surround? Croner and Albright (1997), using a conventional global motion paradigm, first showed that motion coherence thresholds fell when target and distractor elements were made different in color. However, in their paradigm, there was a cue in the static view of the stimulus as to which elements belonged to the target. Arguably, in order to determine whether the visual system automatically groups, or prefilters, the image into different color maps for motion processing, such static form cues should be eliminated. Using various arrangements of the global motion stimulus in which we eliminated all static form cues, we found that global motion thresholds were no better when target and distractors differed in color than when they were identical, except under certain circumstances in which subjects had prior knowledge of the specific target color. We conclude that, in the absence of either static form cues or the possibility of selective attention to the target color, features with similar colors/luminance-polarities are not automatically grouped for global motion analysis.

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“…Adaptation to moving luminance gratings produces motion aftereffects in isolurninant gratings (Cavanagh & Favreau, 1985). Green (1989) found interaction in correspondence matching during stroboscopic motion.…”

Section: Evaluation Of Blackboard and Network Architecturesmentioning

confidence: 99%

Visual search, visual streams, and visual architectures

Green

1991

Perception & Psychophysics

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Most psychological, physiological, and computational models of early vision suggest that retinal information is divided into a parallel set of feature modules. The dominant theories of visual search assume that these modules form a "blackboard" architecture: a set of independent representations that communicate only through a central processor. A review of research shows that blackboard-based theories, such as feature-integration theory, cannot easily explain the existing data. The experimental evidence is more consistent with a "network" architecture, which stresses that: (1) feature modules are directly connected to one another, (2) features and their locations are represented together, (3) feature detection and integration are not distinct processing stages, and (4) no executive control process, such as focal attention, is needed to integrate features. Attention is not a spotlight that synthesizes objects from raw features. Instead, it is better to conceptualize attention as an aperture which masks irrelevant visual information.Two factors make early vision a difficult computational problem. First, the solution space is combinatorially explosive because images contain a large number of feature dimensions. Second, computation must be rapid, so processing time is limited. Many theories suggest that the visual system solves these problems by means of a divideand-eonquer strategy; the retinal image is decomposed into an array of separate representations that are processed in parallel.

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Color and luminance share a common motion pathway

Cited by 125 publications

References 16 publications

Detecting and discriminating the direction of motion of luminance and colour gratings

Detecting and discriminating the direction of motion of luminance and colour gratings

Segregation by color/luminance does not necessarily facilitate motion discrimination in the presence of motion distractors

Visual search, visual streams, and visual architectures

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