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Enhancing Generalization of Visuomotor Adaptation by Inducing Use-dependent Learning
Yuming Lei1, Shancheng Bao2, Monica A Perez3
1University of Miami, Department of Neurological Surgery, The Miami Project to Cure Paralysis, Miami, FL 33136, United States; University of Wisconsin - Milwaukee, Department of Kinesiology, Milwaukee, WI 53201, United States.
Neuroscience
|October 17, 2017
Summary
Use-dependent learning significantly enhances motor skill generalization across different directions and limbs. This involves experiencing desired movements, potentially involving the primary motor cortex (M1).
Area of Science:
- Neuroscience
- Motor Control
- Motor Learning
Background:
- Motor learning typically generalizes across conditions, but the extent varies.
- The mechanisms driving substantial versus partial motor generalization remain unclear.
- Use-dependent learning, driven by repeated action experiences, is a potential factor.
Purpose of the Study:
- To investigate if use-dependent learning enhances motor generalization across movement directions and effectors.
- To explore the role of the primary motor cortex (M1) in use-dependent learning and generalization.
Main Methods:
- Healthy adults adapted to visuomotor rotation while undergoing robot-guided passive movements.
- Repetitive transcranial magnetic stimulation (rTMS) was applied to the primary motor cortex (M1) to modulate cortical excitability.
- Motor-evoked potentials (MEPs) and short-interval intracortical inhibition (SICI) were measured to assess cortical excitability.
Main Results:
- Concurrent passive movements significantly increased generalization across directions (up to 50%) and arms (up to 42%).
- rTMS of M1 increased cortical excitability (higher MEPs, lower SICI) and enhanced inter-limb motor generalization.
- Sham stimulation did not yield similar enhancements in generalization.
Conclusions:
- Use-dependent learning plays a crucial role in enhancing motor generalization.
- The primary motor cortex (M1) is involved in use-dependent learning and its contribution to motor generalization.
- These findings suggest that promoting use-dependent learning could improve motor adaptation and generalization.