Events before the flash Do influence the flash-lag magnitude

The flash-lag effect occurs when a flash abreast of a smoothly moving object is perceived to spatially lag the moving object. The postdiction accounts of this effect assume either that the flash "resets" motion detectors [Science 287 (2000) 2036], or that position information is not comput...

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Bibliographic Details
Published in:Vision research (Oxford) 2004-02, Vol.44 (3), p.235-239
Main Authors: CHAPPELL, Mark, HINE, Trevor J
Format: Article
Language:English
Subjects:
Biological and medical sciences
Cues
Fundamental and applied biological sciences. Psychology
Humans
Motion Perception - physiology
Optical Illusions
Perception
Photic Stimulation
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychophysics
Time Factors
Vision
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Summary:The flash-lag effect occurs when a flash abreast of a smoothly moving object is perceived to spatially lag the moving object. The postdiction accounts of this effect assume either that the flash "resets" motion detectors [Science 287 (2000) 2036], or that position information is not computed for moving objects until it is needed [Trends in the Neurosciences 25 (2002) 293], the latter view having also been proposed by Brenner and Smeets [Vision Research 40 (2000) 1645]. According to these accounts, events occurring before the flash should not change the magnitude of the flash-lag effect. In our experiment, pre-exposure of the moving object as a stationary stimulus, for as little as 50 ms before the flash occurred, significantly reduced the flash-lag effect.
ISSN:0042-6989
DOI:10.1016/j.visres.2003.09.021