Changing objects lead briefly flashed ones

Sheth, Bhavin R.; Nijhawan, Romi; Shimojo, Shinsuke

doi:10.1038/74865

Cited by 130 publications

(116 citation statements)

References 34 publications

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“…The motion aftereffect, an illusory motion percept seen on a static test pattern after prolonged motion adaptation, can displace the apparent position of static targets as well (Snowden, 1998;Nishida & Johnston, 1999). That spatial position is just as abstract a concept in neural terms as any other feature is also brought home by the findings of Sheth, Nijhawan, and Shimojo (2000), who reported the following. Suppose the color of one disk cycles continuously from, say, red to green and back.…”

Section: The Flash-lag Effectmentioning

confidence: 49%

Physical, Neural, and Mental Timing

Grind

2002

Consciousness and Cognition

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Section: The Flash-lag Effectmentioning

confidence: 49%

Physical, Neural, and Mental Timing

Grind

2002

Consciousness and Cognition

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“…Motionlead terminology is inappropriate for yet another reason. It was recently shown that the phenomenon under discussion here also occurs for non-motion features such as luminance, color, and spatial frequency (Sheth et al 2000). The term flash-lag effect may be used without alteration to describe these non-motion-based effects.…”

Section: Resultsmentioning

confidence: 99%

The Flash-Lag Phenomenon: Object Motion and Eye Movements

Nijhawan

2001

Perception

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An object flashed briefly in a given location, the moment another moving object arrives in the same location, is perceived by observers as lagging behind the moving object (flash-lag effect). Does the flash-lag effect occur if the retinal image of the moving object is rendered stationary by smooth pursuit of the moving object? Does the flash-lag effect occur if the retinal image of a stationary object is caused to move by smooth-pursuit eye movements? A disk was briefly flashed in the center of a moving ring such that the ring center was completely ‘filled’ by the disk. In this display, observers perceived the flashed disk to lag such that it appeared only to partially ‘fill’ the ring center. The ‘unfilled’ portion (perceived void) of the moving ring was seen in the color of the background. With smooth pursuit of the ring, the flash-lag effect was eliminated, and observers saw the flashed disk centered on the moving ring. A strong flash-lag effect was observed when observers smoothly pursued a moving point target past a continuously visible stationary ring. Once again, the flashed disk appeared to only partially fill the center of the continuously visible stationary ring, yielding a vivid ‘perceived void’. These results are discussed in terms of neural delays and their compensation.

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“…Finally, is movement itself even necessary? It can be replaced by the repetitive presentation of an invariant object 90 , and a phenomenon very similar to the flash-lag occurs in an experiment in which the colours of two spots are compared 91 . One spot gradually changes colour (say, from green to red), and the other spot is flashed in an intermediate colour (for example, orange) that exactly matches the colour of the changing spot at the instant of the flash.…”

Section: Discussionmentioning

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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Changing objects lead briefly flashed ones

Cited by 130 publications

References 34 publications

Physical, Neural, and Mental Timing

Physical, Neural, and Mental Timing

The Flash-Lag Phenomenon: Object Motion and Eye Movements

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

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