Simple differential latencies modulate, but do not cause the flash-lag effect

Arnold, Derek H., Ong, Yolanda and Roseboom, Warrick (2009) Simple differential latencies modulate, but do not cause the flash-lag effect. Journal of Vision, 9 5: 4.1-4.8. doi:10.1167/9.5.4

Author Arnold, Derek H.
Ong, Yolanda
Roseboom, Warrick
Title Simple differential latencies modulate, but do not cause the flash-lag effect
Journal name Journal of Vision   Check publisher's open access policy
ISSN 1534-7362
Publication date 2009-05-08
Sub-type Article (original research)
DOI 10.1167/9.5.4
Open Access Status DOI
Volume 9
Issue 5
Start page 4.1
End page 4.8
Total pages 8
Editor Andrew B. Watson
Alice O'Donnell
Place of publication Rockville, MD, United States
Publisher Association for Research in Vision and Ophthalmology
Language eng
Subject 1799 Other Psychology and Cognitive Sciences
970117 Expanding Knowledge in Psychology and Cognitive Sciences
Abstract When a brief static flash is presented in physical alignment with a moving target, the position of the flash can seem to lag behind that of the moving target. Various explanations exist. One of the most popular is the differential latency hypothesis. This assumes that neural latencies for moving stimuli are shorter than those for static stimuli. Accordingly, the flash lag would occur because perception is temporally fragmented, with moving stimuli seen before static. To test this, observers were asked to make different judgments concerning the same stimulus. Observers either judged if color changes in moving and static stimulus sections were synchronous, or whether the different stimulus sections were aligned at the time of a color change. If the flash-lag were driven by a simple differential latency, we would expect both judgments to be marked by a temporal advantage for moving stimuli. Our results suggest the contrary, as only the later judgment was marked by a flash-lag effect. The apparent timing of moving and static color changes was veridical. However, when we introduced a systematic differential latency, by modulating image contrast, both judgments were affected. Our data therefore suggest that a simple differential can modulate flash-lag type effects, but they do not cause the phenomenon.
Keyword Flash lag
Visual latency
Image contrast
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article number 4

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
ERA 2012 Admin Only
School of Psychology Publications
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Created: Thu, 03 Sep 2009, 17:55:37 EST by Mr Andrew Martlew on behalf of School of Psychology