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Pisella et al. (2000) have shown that fast aiming movements are automatically modified on-line in response to a change in target position. Specifically, when a movement is less than 300ms in duration the reach is completed to a target’s new location even when one never intended to respond to the target jump. In contrast, when movements are slower, the reach is completed according to instructions....
When a target moves to a new location during a rapid aiming movement, the hand follows it, even when the participant intends not to. Pisella et al. (Nat Neurosci 3:729–736, 2000) claim that the posterior parietal cortex, in the dorsal visual stream, is responsible for this ‘automatic pilot’. Here we study the limits of automaticity in the dorsal stream through analysis of aiming movements to two targets...
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