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- W2123886910 abstract "Numerous studies of motor learning have examined the adaptation of hand trajectories and grip forces when moving grasped objects with novel dynamics. Such objects initially result in both kinematic and kinetic errors; i.e., mismatches between predicted and actual trajectories and between predicted and actual load forces. Here we investigated the contribution of these errors to both trajectory and grip force adaptation. Participants grasped an object with novel dynamics using a precision grip and moved it between two targets. Kinematic errors could be effectively removed using a force channel to constrain hand motion to a straight line. When moving in the channel, participants learned to modulate grip force in synchrony with load force and this learning generalized when movement speed in the channel was doubled. When the channel was removed, these participants continued to effectively modulate grip force but exhibited substantial kinematic errors, equivalent to those seen in participants who did not previously experience the object in the channel. We also found that the rate of grip force adaptation did not depend on whether the object was initially moved with or without a channel. These results indicate that kinematic errors are necessary for trajectory but not grip force adaptation, and that kinetic errors are sufficient for grip force but not trajectory adaptation. Thus, participants can learn a component of the object's dynamics, used to control grip force, based solely on kinetic errors. However, this knowledge is apparently not accessible or usable for controlling the movement trajectory when the channel is removed." @default.
- W2123886910 created "2016-06-24" @default.
- W2123886910 creator A5022980780 @default.
- W2123886910 creator A5076324095 @default.
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- W2123886910 date "2013-01-30" @default.
- W2123886910 modified "2023-09-25" @default.
- W2123886910 title "Separate Contributions of Kinematic and Kinetic Errors to Trajectory and Grip Force Adaptation When Transporting Novel Hand-Held Loads" @default.
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- W2123886910 doi "https://doi.org/10.1523/jneurosci.3772-12.2013" @default.
- W2123886910 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6619110" @default.
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