Related Experiment Video
Updated: Jun 10, 2026
07:52
Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
Published on: September 18, 2020
Bi-stability of movement coordination as a function of skill level and task difficulty
Yeou-Teh Liu1, Gottfried Mayer-Kress, Karl M Newell
1Graduate Institute of Exercise and Sport Science, National Taiwan Normal University, Taipei City, Taiwan. Yeouteh@ntnu.edu.tw
Summary
Movement coordination stability in a roller ball task depends on practice level and initial conditions. Task difficulty acts as a control parameter, compensating for practice time and influencing success thresholds.
Area of Science:
- Motor control and learning
- Human movement science
- Dynamical systems theory
Background:
- Understanding factors influencing motor skill acquisition is crucial for optimizing training.
- Movement coordination stability is often studied using dynamical systems approaches.
- Initial conditions and task difficulty are known to affect motor task performance.
Purpose of the Study:
- To investigate the interaction between practice level, initial conditions, and task difficulty in a roller ball motor task.
- To determine how these factors influence the stability of movement coordination.
- To model the transition from task failure to success as a function of practice.
Main Methods:
- Manipulation of practice level and task difficulty (ball angular velocity, friction) as control parameters.
- Assessment of movement coordination stability in a roller ball task.
- Analysis of bi-stability and hysteresis in coordination modes.
- Modeling the transition using saddle-node bifurcation theory.
Main Results:
- Bi-stability and hysteresis were observed, indicating dependence on initial conditions.
- The transition from failure to success followed a saddle-node bifurcation pattern.
- Task difficulty was found to act as a control parameter dual to skill level.
Conclusions:
- Practice level and initial conditions significantly interact to determine movement coordination stability.
- Task difficulty effectively compensates for practice time and influences performance thresholds.
- The findings support a dynamical systems perspective on motor skill acquisition and performance.
Related Concept Videos
01:13Stability of Equilibrium Configuration: Problem Solving
The stability of equilibrium configurations is an important concept in physics, engineering, and other related fields. In simple terms, it refers to the tendency of an object or system to return to its equilibrium position after being disturbed. The stability of an equilibrium configuration can be analyzed by considering the potential energy function of the system and examining its behavior near the equilibrium point.
Problem-solving in the context of the stability of equilibrium configuration...
Problem-solving in the context of the stability of equilibrium configuration...
01:18Hierarchy of Motor Control
The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
01:23Stability of Equilibrium Configuration
Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
01:14Stability of structures
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
01:24Pole and System Stability
The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.