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Related Experiment Video

Updated: Sep 29, 2025

Investigating Motor Skill Learning Processes with a Robotic Manipulandum

Investigating Motor Skill Learning Processes with a Robotic Manipulandum

Published on: February 12, 2017

Muscle synergies are modified with improved task performance in skill learning.

Sangsoo Park¹, Graham E Caldwell²

¹Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA 01003, United States of America; College of Medicine, Korea University, Seoul 20841, South Korea.

Human Movement Science

|March 25, 2022

Summary

Motor skill learning in cyclists did not change the number of muscle synergies but altered their structure and activation. These changes in muscle coordination strategies improve task performance while maintaining smooth motion.

Keywords:

Control Coordination Degrees of freedom Matrix factorization Neural Pedaling

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Area of Science:

Motor control and biomechanics
Neuroscience of motor learning

Background:

Muscle synergies are fundamental to motor control.
Understanding how these synergies adapt during skill acquisition is crucial for motor learning research.

Purpose of the Study:

To investigate the relationship between the number of muscle synergies and skill acquisition.
To examine how muscle synergy structure and activation patterns change during motor skill learning.

Main Methods:

Muscle synergy analysis was performed using non-negative matrix factorization.
Activation patterns of ten major leg muscles were recorded before and after learning a novel one-legged pedal force aiming task.
Synergy number was determined by the minimum factors explaining a predefined data variance threshold.

Main Results:

Skill acquisition, evidenced by improved pedal force direction, occurred without a change in the number of muscle synergies (four).
Task performance improved due to alterations in the structure (muscle weightings) of one synergy and activation amplitudes of three synergies.
Cooperative changes in synergy structure and activation across crank cycle quadrants were observed.

Conclusions:

The number of muscle synergies may be constrained by task demands during motor skill learning.
Motor skill learning involves adaptive changes in muscle synergy structure and activation levels, representing key coordination strategies.
These findings provide insights into the neural mechanisms underlying motor skill acquisition.