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Top view of the total drift in the experiment by van Beers et al. (14). Data are averaged over all subjects. The length of the arrows equals 2.5 times the total drift. Subjects moved repeatedly with the right hand to the same target, leading to a gradual drift away from the target position. This drift was in a clearly different direction if the target was the left arm (filled arrows) than if the target was a visual marker (open arrows).
