CUED Publications database

The Sensorimotor System Can Sculpt Behaviorally Relevant Representations for Motor Learning.

Franklin, DW and Batchelor, AV and Wolpert, DM (2016) The Sensorimotor System Can Sculpt Behaviorally Relevant Representations for Motor Learning. eNeuro, 3.

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The coordinate system in which humans learn novel motor skills is controversial. The representation of sensorimotor skills has been extensively studied by examining generalization after learning perturbations specifically designed to be ambiguous as to their coordinate system. Recent studies have found that learning is not represented in any simple coordinate system and can potentially be accounted for by a mixed representation. Here, instead of probing generalization, which has led to conflicting results, we examine whether novel dynamics can be learned when explicitly and unambiguously presented in particular coordinate systems. Subjects performed center-out reaches to targets in the presence of a force field, while varying the orientation of their hand (i.e., the wrist angle) across trials. Different groups of subjects experienced force fields that were explicitly presented either in Cartesian coordinates (field independent of hand orientation), in object coordinates (field rotated with hand orientation), or in anti-object coordinates (field rotated counter to hand orientation). Subjects learned to represent the dynamics when presented in either Cartesian or object coordinates, learning these as well as an ambiguous force field. However, learning was slower for the object-based dynamics and substantially impaired for the anti-object presentation. Our results show that the motor system is able to tune its representation to at least two natural coordinate systems but is impaired when the representation of the task does not correspond to a behaviorally relevant coordinate system. Our results show that the motor system can sculpt its representation through experience to match those of natural tasks.

Item Type: Article
Uncontrolled Keywords: coordinate frame dynamics motor learning Adaptation, Physiological Adaptation, Psychological Adult Analysis of Variance Arm Biomechanical Phenomena Female Hand Humans Learning Male Motor Skills Physical Stimulation Random Allocation
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:55
Last Modified: 22 May 2018 07:48