Events before the flash Do influence the flash-lag magnitude

Mark Chappell; Trevor J Hine

doi:10.1016/j.visres.2003.09.021

Events before the flash Do influence the flash-lag magnitude

Vision Res. 2004 Feb;44(3):235-9. doi: 10.1016/j.visres.2003.09.021.

Authors

Mark Chappell¹, Trevor J Hine

Affiliation

¹ School of Applied Psychology, Griffith University, Nathan, Queensland 4111, Australia. m.chappell@griffith.edu.au

PMID: 14642895
DOI: 10.1016/j.visres.2003.09.021

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Cues*
Humans
Motion Perception / physiology*
Optical Illusions*
Photic Stimulation*
Psychophysics
Time Factors