| Judgments of synchrony between auditory and moving or still visual stimuli. | |
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MedLine Citation:
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PMID: 18266504 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The flash-lag effect is a visual illusion wherein intermittently flashed, stationary stimuli seem to trail after a moving visual stimulus despite being flashed synchronously. We tested hypotheses that the flash-lag effect is due to spatial extrapolation, shortened perceptual lags, or accelerated acquisition of moving stimuli, all of which call for an earlier awareness of moving visual stimuli over stationary ones. Participants judged synchrony of a click either to a stationary flash of light or to a series of adjacent flashes that seemingly bounced off or bumped into the edge of the visual display. To be judged synchronous with a stationary flash, audio clicks had to be presented earlier--not later--than clicks that went with events, like a simulated bounce (Experiment 1) or crash (Experiments 2-4), of a moving visual target. Click synchrony to the initial appearance of a moving stimulus was no different than to a flash, but clicks had to be delayed by 30-40 ms to seem synchronous with the final (crash) positions (Experiment 2). The temporal difference was constant over a wide range of motion velocity (Experiment 3). Interrupting the apparent motion by omitting two illumination positions before the last one did not alter subjective synchrony, nor did their occlusion, so the shift in subjective synchrony seems not to be due to brightness contrast (Experiment 4). Click synchrony to the offset of a long duration stationary illumination was also delayed relative to its onset (Experiment 5). Visual stimuli in motion enter awareness no sooner than do stationary flashes, so motion extrapolation, latency difference, and motion acceleration cannot explain the flash-lag effect. |
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Authors:
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George Fouriezos; Gary Capstick; François Monette; Christine Bellemare; Matthew Parkinson; Angela Dumoulin |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Canadian journal of experimental psychology = Revue canadienne de psychologie expérimentale Volume: 61 ISSN: 1196-1961 ISO Abbreviation: Can J Exp Psychol Publication Date: 2007 Dec |
Date Detail:
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Created Date: 2008-02-12 Completed Date: 2008-04-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9315513 Medline TA: Can J Exp Psychol Country: Canada |
Other Details:
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Languages: eng Pagination: 277-92 Citation Subset: IM |
Affiliation:
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School of Psychology, University of Ottawa. georgef@uottawa.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Attention Auditory Perception* Awareness Discrimination (Psychology) Female Humans Judgment* Male Middle Aged Motion Perception* Optical Illusions* Orientation Pattern Recognition, Visual* Photic Stimulation Psychophysics Reaction Time Time Perception* |
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