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Related Experiment Video

Updated: May 25, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

Stabilization strategies for unstable dynamics.

Devjani J Saha¹, Pietro Morasso

¹Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, United States of America. dsaha4@gmail.com

|January 27, 2012

Summary

This summary is machine-generated.

Humans can stabilize unstable tasks using high-stiffness or low-stiffness strategies. Most subjects preferred high-stiffness for quicker stabilization, while others used low-stiffness for less effort, demonstrating multiple solutions for skilled behavior.

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Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

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Last Updated: May 25, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Area of Science:

Human motor control
Robotics
Biomechanics

Background:

Humans employ high-stiffness (elastic properties) or low-stiffness (positional feedback) strategies for unstable tasks.
Task and neuromuscular constraints often dictate strategy choice.

Purpose of the Study:

Investigate human strategy selection in unstable environments.
Compare effort and control demands of high-stiffness versus low-stiffness stabilization.

Main Methods:

A bimanual planar robot simulated an unstable environment and a virtual mass.
Subjects balanced the mass using two non-linear elastic linkages connecting to each hand.
Task allowed for stabilization via high-stiffness (stretching linkages) or low-stiffness (force impulses).

Main Results:

62% of subjects adopted the high-stiffness strategy, aligning stiffness with instability.
Remaining subjects used the low-stiffness strategy with no preferred stiffness orientation.
High-stiffness strategy led to quicker stabilization; low-stiffness required more time but less effort.

Conclusions:

Strategy choice depends on bimanual coordination: high-stiffness involves hand separation, low-stiffness involves keeping hands close.
Multiple solutions exist for skilled behavior in unstable environments.
Different strategies result in distinct types of skilled motor behavior.