Journal
VISION RESEARCH
Volume 46, Issue 22, Pages 3909-3914Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.visres.2006.06.003
Keywords
flash-lag; second-order motion
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Possible physiological mechanisms to explain the flash-lag effect, in which subjects perceive a flashed item that is co-localized with a moving item as trailing behind the moving item, have been found within the retina of lower species, and in the motor pathways of humans. Here, we demonstrate flash-lag employing second-order moving and flashed stimuli, defined solely by their binocular-disparity, to circumvent any possible early contributions to the effect. A significant flash-lag effect was measured with cyclopean stimuli composed entirely of correlated random dot patterns. When the disparity-defined moving stimulus was replaced with a luminance-defined one, potentially engaging retinal mechanisms, the magnitude of the measured effect showed no significant change. Thus, in primates, though retinal mechanisms may contribute, flash-lag must be explained through cortical processes. (c) 2006 Elsevier Ltd. All rights reserved.
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