Motion extrapolation is not responsible for the flash–lag effect

Brenner, Eli; Smeets, Jeroen B. J.

doi:10.1016/s0042-6989(00)00067-5

Cited by 141 publications

(146 citation statements)

References 9 publications

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133

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“…The extrapolation hypothesis was based on studies of the`£ash-lag phenomenon', in which a continuously moving bar is perceived to be ahead of a stationary £ashed (stroboscopically illuminated) bar when the two images are spatially aligned on the retina. Although other explanations for this phenomenon have been advanced (Baldo & Klein 1995;Purushothaman et al 1998;Brenner & Smeets 2000;Whitney et al 2000), the extrapolation hypothesis is supported by the results of this study. The ecological advantage of such operations for both perception and action is clear.…”

Section: Discussionsupporting

confidence: 79%

Evidence for dissociation between the perceptual and visuomotor systems in humans

Yamagishi

Anderson

Ashida

2001

Proc. R. Soc. Lond. B

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When a visual stimulus is continuously moved behind a small stationary window, the window appears displaced in the direction of motion of the stimulus. In this study we showed that the magnitude of this illusion is dependent on (i) whether a perceptual or visuomotor task is used for judging the location of the window, (ii) the directional signature of the stimulus, and (iii) whether or not there is a signi¢cant delay between the end of the visual presentation and the initiation of the localization measure. Our stimulus was a drifting sinusoidal grating windowed in space by a stationary, two-dimensional, Gaussian envelope ( 1 cycle of sinusoid). Localization measures were made following either a short (200 ms) or long (4.2 s) post-stimulus delay. The visuomotor localization error was up to three times greater than the perceptual error for a short delay. However, the visuomotor and perceptual localization measures were similar for a long delay. Our results provide evidence in support of the hypothesis that separate cortical pathways exist for visual perception and visually guided action and that delayed actions rely on stored perceptual information.

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Section: Discussionsupporting

confidence: 79%

Evidence for dissociation between the perceptual and visuomotor systems in humans

Yamagishi

Anderson

Ashida

2001

Proc. R. Soc. Lond. B

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“…Previous studies of forward displacement did not consider the judged timing of the target's offset. 4 However, in other positional errors when a moving stimulus is presented (the Fröhlich effect and the flash-lag effect), the timing factor is a critical cause of these errors (Brenner & Smeets, 2000;Müller & Findlay, 1988;Murakami, 2001;Whitney & Murakami, 1998). A timing error explanation might also be possible in the case of forward displacement.…”

Section: Discussionmentioning

confidence: 99%

Illusory motion and representational momentum

Nagai

Saiki

2005

Perception & Psychophysics

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When a moving target vanishes abruptly, participants judge its final position as being ahead of its actual final position, in the direction of motion (representational momentum;Freyd & Finke, 1984). In the present study, we presented illusory motion and examined whether or not forward displacement was affected by the perceived direction and speed of the target. Experiments 1A and 1B showed that an illusory direction of movement of a target was perceived, and Experiment 2 showed that an illusory speed of a moving target was observed. However, neither the direction nor the magnitude of forward displacement was affected by these illusions. Therefore, it was suggested that the mechanism underlying forward displacement (or some extrapolation processing) uses different motion signals than does the perceptual mechanism.

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“…The effect depends on whether the moving stimulus is perceived as an object of which the flash is a part 82 . The magnitude of the illusion changes if the velocity of the moving stimulus changes after the flash 83 , and the illusion completely disappears if the moving object is blanked immediately after the flash, clearly indicating that the critical period is the one that follows the flash 70,71,84 . On the other hand, the illusion remains intact if the flash is replaced by a continuously lit stimulus and the moving stimulus transiently changes (in size, luminance or colour) when it passes in alignment with the stationary stimulus.…”

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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Motion extrapolation is not responsible for the flash–lag effect

Cited by 141 publications

References 9 publications

Evidence for dissociation between the perceptual and visuomotor systems in humans

Evidence for dissociation between the perceptual and visuomotor systems in humans

Illusory motion and representational momentum

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

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