Volume 7, Number 7, Article 1, Pages 1-7 doi:10.1167/7.7.1 http://journalofvision.org/7/7/1/ ISSN 1534-7362
Motion signal and the perceived positions of moving objects
Daniel Linares
Grup Recerca Neurociència Cognitiva, Parc Científic-Facultat de Psicologia, Universitat de Barcelona, Barcelona, Spain
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Joan López-Moliner
Grup Recerca Neurociència Cognitiva, Parc Científic-Facultat de Psicologia, Universitat de Barcelona, Barcelona, Spain
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Alan Johnston
Department of Psychology, Complex, Institute of Cognitive Neuroscience, University College London, London, United Kingdom
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Abstract

When a flash is presented in spatial alignment with a moving stimulus, the flash appears to lag behind (the flash-lag effect). The motion of the object can influence the position of the flash, but there may also be a reciprocal effect of the flash on the moving object. Here, we demonstrate that this is the case. We show that when a flash is presented near the moving object, the flash-lag effect does not depend greatly on the duration of the preflash trajectory. However, when the flash is presented sufficiently far from the moving object, the flash-lag effect increases with the duration of the preflash trajectory, until it reaches an asymptotic level. We also show that the interaction of the near flash can occur when it is task irrelevant. Finally, using the motion aftereffect, we demonstrate that motion signals are involved in the time evolution of the flash-lag effect.

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History
Received October 19, 2006; published May 7, 2007
Citation
Linares, D., López-Moliner, J., & Johnston, A. (2007). Motion signal and the perceived positions of moving objects. Journal of Vision, 7(7):1, 1-7, http://journalofvision.org/7/7/1/, doi:10.1167/7.7.1.
Keywords
flash-lag effect, temporal mechanisms, spatial mechanisms, motion aftereffect
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