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Psychological Research

, Volume 67, Issue 4, pp 233–239 | Cite as

Asynchronous perception of motion and luminance change

  • Dirk KerzelEmail author
Original Article

Abstract.

Observers were asked to indicate when a target moving on a circular trajectory changed its luminance. The judged position of the luminance change was displaced from the true position in the direction of motion, indicating differences between the times-to-consciousness of motion and luminance change. Motion was processed faster than luminance change. The latency difference was more pronounced for a small (116–134 ms) than for a large luminance decrement (37 ms). The results show that first-order motion is perceived before an accurate representation of luminance is available. These findings are consistent with current accounts of the flash-lag effect. Two control experiments ruled out that the results were due to a general forward tendency. Localization of the target when an auditory signal was presented did not produce forward displacement, and the judged onset of motion was not shifted in the direction of motion.

Keywords.

Position Judgments Consciousness Luminance Motion Modular Perception Flash-lag effect 

Notes

Acknowledgements.

I wish to thank B. Hommel, J. Müsseler and S. Stork for valuable suggestions on the manuscript and S. Bauer and M. Tirú for helping to collect the data.

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Copyright information

© Springer-Verlag  2003

Authors and Affiliations

  1. 1.FB 06, Psychologie und Sportwissenschaft, Abteilung Allgemeine Psychologie, Otto-Behaghel-Str. 10F, 35394 Gießen, Germany

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