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Pubmed for Handhelds

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  • Title: Observer's control of the moving stimulus increases the flash-lag effect.
    Author: Scocchia L, Grosso RA, de'Sperati C, Stucchi N, Baud-Bovy G.
    Journal: Vision Res; 2009 Sep; 49(19):2363-70. PubMed ID: 19596025.
    Abstract:
    The flash-lag effect (FLE) consists in perceiving a briefly presented stationary stimulus to lag behind an aligned moving stimulus. This study investigates the effects of actively controlling the moving stimulus. By means of a robotic arm, observers continuously moved a dot along a circular trajectory, and a flash was displayed closely at unpredictable times. In two experiments, we found that the FLE was larger when participants controlled the moving stimulus, compared to a computer-controlled condition. Two control conditions tested the possibility that the observed modulation of the FLE was due to visuo-spatial attention or dual-task factors. This study provides evidence that the motor system interacts with and possibly speeds up the processing of a moving visual stimulus when the observer controls its movement.
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