Explaining human motor coordination via the synergy expansion hypothesis.

Area of Science:

• Neuroscience
• Human Motor Control
• Developmental Psychology

Background:

• Bernstein's degrees of freedom problem has been a central challenge in motor control for over 60 years.
• Motor synergies are proposed as a key mechanism for simplifying the control of complex neuro-musculo-skeletal systems.
• Existing theories offer partial explanations for synergy function and development.

Purpose of the Study:

• To investigate the nature and role of motor synergies.
• To propose a theoretical framework, the "expansion hypothesis," to address Bernstein's problem.
• To elucidate the mechanical, developmental, and behavioral aspects of synergies.

Main Methods:

• Theoretical framework development (expansion hypothesis).
• Proposition articulation (mechanical, developmental, behavioral).
• Numerical simulation for hypothesis clarification.

Main Results:

• The expansion hypothesis provides a structured approach to understanding synergy quantity, learning, and usage.
• A numerical simulation illustrated the propositions of the expansion hypothesis.
• The hypothesis integrates existing knowledge on motor synergies in healthy and impaired individuals.

Conclusions:

• The expansion hypothesis offers a comprehensive framework for comprehending the nature, use, and evolution of human motor skills.
• This framework aids in explaining how humans manage complex movements with apparent ease.
• It provides a foundation for future research in motor control and development.