De Bruyn B, 2004, "The effect of perceptual motion repulsion on action is task-dependent" Perception 33 ECVP Abstract Supplement
The effect of perceptual motion repulsion on action is task-dependent
B De Bruyn
Exactly how perceptual illusions affect actions like pointing or grasping is an issue of much debate. Here, I report results of an experiment in which a touch-screen was used to evaluate the effect of visually misperceived motion direction (the motion repulsion phenomenon) on three types of action (i) pointing to the end of the motion path, (ii) pointing to the start and the end of the motion, and (iii) tracing the motion path. Pointing to the end of the motion path did not show a directional bias and confirms results from induced-motion studies that argue in favour of a mismatch between perception and action. However, in two novel multi-pointing tasks, pointing to start and end as well as tracing the motion path, action was influenced by the misperceived motion direction with directional biases of more than 20°. For the latter tasks, perception does affect action. These results show that the effect perception can have on action is task-dependent.
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