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Human movements vary across repetitions and the structure of this variability can shed light on motor control and learning. Previous studies showed that humans adapt their movements to minimize the effect of their intrinsic variability on the task goal. This study shows that in complex object manipulation there are also extrinsic contributions to variability from the deterministic nonlinear object...
Manipulation of complex objects such as carrying a cup of coffee is ubiquitous in daily activities. To gain insight into the control of such motor skills, the present study examines how humans adapt their amplitude and frequency and force when rhythmically manipulating a nonlinear dynamic object, and what these selections mean in terms of movement strategy. In two experiments, subjects were asked...
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