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Related Experiment Video

Updated: Mar 15, 2026

Investigating Motor Skill Learning Processes with a Robotic Manipulandum
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The Sensorimotor System Can Sculpt Behaviorally Relevant Representations for Motor Learning.

David W Franklin1, Alexandra V Batchelor2, Daniel M Wolpert3

  • 1Computational and Biological Learning Laboratory, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom; Neuromuscular Diagnostics, Department of Sport and Health Sciences, Technical University of Munich, 80992 Munich, Germany.

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Summary

Humans can learn motor skills in different coordinate systems, including Cartesian and object-based. However, learning is impaired when the dynamics are presented in an anti-object coordinate system, suggesting the motor system adapts to relevant task representations.

Keywords:
coordinate framedynamicsmotor learning

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • The coordinate system used for learning novel motor skills is a subject of ongoing debate.
  • Previous studies on sensorimotor skill generalization have yielded conflicting results regarding the representation of learned dynamics.
  • A mixed representation, rather than a simple coordinate system, has been proposed to account for motor learning.

Purpose of the Study:

  • To investigate whether novel dynamics can be learned when explicitly presented in unambiguous coordinate systems.
  • To determine if the motor system can adapt to different representational frames of reference.
  • To clarify the role of coordinate systems in motor skill acquisition.

Main Methods:

  • Participants performed center-out reaching movements under a force field.
  • Hand orientation (wrist angle) was varied across trials.
  • Force fields were explicitly presented in Cartesian, object, or anti-object coordinate systems.

Main Results:

  • Motor learning occurred when dynamics were presented in Cartesian or object coordinates.
  • Learning was slower in the object-based coordinate system compared to Cartesian.
  • Motor learning was substantially impaired when dynamics were presented in the anti-object coordinate system.

Conclusions:

  • The motor system can adapt its internal representation to at least two natural coordinate systems (Cartesian and object-based).
  • Motor learning is hindered when the presented dynamics do not align with behaviorally relevant coordinate systems.
  • Motor representations are sculpted by experience to match the demands of natural tasks.