Asynchronous processing in vision

Arnold, Derek H.; Clifford, Colin W. G.; Wenderoth, Peter

doi:10.1016/s0960-9822(01)00156-7

Cited by 87 publications

(73 citation statements)

References 19 publications

(6 reference statements)

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“…Although the evidence here shows that external transients can reduce or eliminate the asynchrony between the color and motion, color-contingent motion aftereffects (Arnold, Clifford, & Wenderoth, 2001) demonstrate color motion asynchronies in the absence of any report or transient-triggered access in this task. The aftereffect may be proportional to the crosscorrelation of time-varying response profiles to the two features (Clifford et al, 2003).…”

Section: Ring Transients Allow Access To Motion and Color Without Difcontrasting

confidence: 66%

Independent, synchronous access to color and motion features

Holcombe

Cavanagh

2008

Cognition

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We investigated the role of attention in pairing superimposed visual features. When moving dots alternate in color and in motion direction, reports of the perceived color and motion reveal an asynchrony: the most accurate reports occur when the motion change precedes the associated color change by ~100 ms [Moutoussis, K., & Zeki, S. (1997). A direct demonstration of perceptual asynchrony in vision. Proceedings of the Royal Society of London B, 264,[393][394][395][396][397][398][399]. This feature binding asynchrony was probed by manipulating endogenous and exogenous attention. First, endogenous attention was manipulated by changing which feature dimension observers were instructed to attend to first. This yielded little effect on the asynchrony. Second, exogenous attention was manipulated by briefly presenting a ring around the target, cueing the report of the color and motion seen within the ring. This reduced or eliminated the apparent latency difference between color and motion. Accuracy was best predicted by timing of each feature relative to the cue rather than the timing of the two features relative to each other, suggesting independent attentional access to the two features with an exogenous attention cue. The timing of attentional cueing affected feature pairing reports as much as the timing of the features themselves.

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Section: Ring Transients Allow Access To Motion and Color Without Difcontrasting

confidence: 66%

Independent, synchronous access to color and motion features

Holcombe

Cavanagh

2008

Cognition

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“…This kind of 'miss-binding' was interpreted as color being processed faster than motion. Similar phenomena were observed in other paradigms [11,12]. Nishida and Johnston [13], however, used a different response mode and showed that motion and color were perceived without asynchrony.…”

Section: Introductionsupporting

confidence: 77%

“…This suggests that in human observers, the neural processing of motion information precedes that of color. Does the discrepancy between different studies [9][10][11][12][13][14]21] mentioned earlier reflect different type of measures? Why does the timing of neural events and perceptual temporal judgments suggest a different order of operations?…”

Section: Discussionmentioning

confidence: 99%

Perceptual asynchrony: motion leads color

Wang

Fan

et al. 2006

NeuroReport

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It is widely accepted that motion and color are processed in separate brain areas of primates. Numerous studies on monkeys suggest that neural mechanisms responsible for motion processing respond faster than those for color. Recent studies on humans, however, provide contradictory evidence. Is this discrepancy due to a gap between species (animal vs. human), or between measures (neurophysiological vs. behavioral)? To help resolve this issue, event-related potentials were acquired as human participants viewed motion and color stimuli. Results indicated that the physiological response evoked by motion arose earlier than that by color, which is consistent with previous ¢ndings in animals.This temporal precedence of motion signal processing over color was corroborated in a parallel behavioral experiment. IntroductionPhysiological research in primates suggests that different attributes, especially motion and color, are processed by different parts of the visual system [1,2]. Motion and color travel from the retina to the cortex primarily through the magnocellular and parvocellular pathway, respectively. In the cortex, motion receives specialized processing in area MT whereas color processing occurs in area V4 (V8) [3][4][5].Given the fact that motion and color information processing have different and relatively independent pathways, it would not be surprising if they also demonstrate different temporal properties. Indeed, single-unit studies in animals suggested that neurons specialized for motion processing respond earlier and faster than those for color in both the retina and lateral geniculate nucleus [6,7]. At the cortical level, it was found that neurons specialized for motion signals in V2 activate earlier than those for color [8]. It was also reported that area V4 activates later than MT and MST [9].This motion-led-color asynchrony can, however, be reversed or eliminated when human observers perceive joint occurrences of motion and color. A striking phenomenon, motion-color asynchrony, was recently demonstrated by Moutoussis and Zeki [10]. Participants viewed moving squares with oscillating changes in both the color and the direction of motion, the temporal phase of which varied in different trials. Participants had to indicate the combined perception of color and direction (e.g. green up, red down or green down, red up). Results showed that observers tended to associate the change in direction of motion together with the color change that occurred about 60-80 milliseconds (ms) later. This kind of 'miss-binding' was interpreted as color being processed faster than motion. Similar phenomena were observed in other paradigms [11,12]. Nishida and Johnston [13], however, used a different response mode and showed that motion and color were perceived without asynchrony. Bedell and colleagues [14] also proposed a twostage model to account for the different observations on color-motion asynchrony, with the first stage dependent on the sensory processing and the second stage dependent more on task.Clearly, there is a...

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“…For instance, they are shorter the greater the stimulus luminance 69 and the closer the stimulus is to the fovea. Also, in terms of perceptual awareness (which might involve processing time 74 ), there are latency differences 75,76 , such that colour might seem to be perceived before orientation, which is perceived before motion 77 . Along these lines, it is possible to explain the flash-lag effect as a consequence of differences in latency, if one assumes that the latency of a stationary stimulus (a flash) is longer than the latency of a moving stimulus [69][70][71] .…”

Section: The Flash-lag Effectmentioning

confidence: 99%

Through the eye, slowly; Delays and localization errors in the visual system

2002

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Reviews on the visual system generally praise its amazing performance. Here we deal with its biggest weakness: sluggishness. Inherent delays lead to mislocalization when things move or, more generally, when things change. Errors in time translate into spatial errors when we pursue a moving object, when we try to localize a target that appears just before a gaze shift, or when we compare the position of a flashed target with the instantaneous position of a continuously moving one (or one that appears to be moving even though no change occurs in the retinal image). Studying such diverse errors might rekindle our thinking about how the brain copes with real-time changes in the world.

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Asynchronous processing in vision

Cited by 87 publications

References 19 publications

Independent, synchronous access to color and motion features

Independent, synchronous access to color and motion features

Perceptual asynchrony: motion leads color

Through the eye, slowly; Delays and localization errors in the visual system

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