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Related Experiment Video

Updated: May 12, 2026

Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

The Influence of Cognitive Task Difficulty on Automatic Postural Control During Quiet Stance.

Erika H Tworzyanski1, George Mochizuki1,2

  • 1School of Kinesiology and Health Science, York University, Toronto, Canada.

Journal of Motor Behavior
|May 11, 2026
PubMed
Summary

Cognitive dual-tasks while standing engage automatic postural control. This study found that postural sway and automaticity remain consistent regardless of cognitive task difficulty in healthy young adults.

Keywords:
cognitive task difficultydual-tasknon-linear analysispostural controlyoung adults

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Movement Science

Background:

  • Standing balance relies on cognitive resource allocation.
  • Automatic postural control mechanisms are engaged during distraction.
  • The impact of cognitive load on postural automaticity requires further investigation.

Purpose of the Study:

  • To investigate if cognitive task difficulty affects automatic postural control.
  • To determine the influence of cognitive load on postural sway magnitude.
  • To examine the interplay between cognitive tasks, visual input, and postural stability.

Main Methods:

  • Twenty-six healthy young adults performed quiet standing with and without cognitive tasks (arithmetic).
  • Automaticity was measured using center of pressure (COP) sample entropy.
  • Postural sway magnitude and variability were quantified via COP ellipse area and root mean square.

Main Results:

  • Cognitive dual-tasking increased COP sample entropy and reduced sway variability.
  • These changes in automaticity and sway did not significantly vary with cognitive task difficulty.
  • Visual input manipulation had inconsistent effects across different measures.

Conclusions:

  • Healthy young adults utilize automatic postural control mechanisms irrespective of cognitive load.
  • Cognitive task difficulty does not modulate the automaticity of postural control in quiet stance.
  • The findings highlight the robustness of automatic postural control under cognitive dual-task conditions.