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Nature 394, 780-784 (20 August 1998) | doi:10.1038/29528;

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Signal-dependent noise determines motor planning

When we make saccadic eye movements or goal-directed arm movements, there is an infinite number of possible trajectories that the eye or arm could take to reach the target,. However, humans show highly stereotyped trajectories in which velocity profiles of both the eye and hand are smooth and symmetric for brief movements,.

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