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Contributions of delayed visual feedback and cognitive task load to postural dynamics.

Ting Ting Yeh1, Jason Boulet, Tyler Cluff

  • 1Sensorimotor Neuroscience Laboratory, Department of Kinesiology, McMaster University, Hamilton, ON, Canada L8S 4K1.

Neuroscience Letters
|July 6, 2010
PubMed
Summary

Postural control relies on distinct time scales, with vision primarily affecting slow sway and cognitive tasks influencing fast sway. Delayed visual feedback impacts both slow and fast postural sway components.

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Area of Science:

  • Neuroscience
  • Human Movement Science
  • Biomechanics

Background:

  • Postural control is crucial for stability and relies on sensory integration.
  • Visual and cognitive inputs significantly influence balance.
  • Understanding the temporal dynamics of postural control is essential.

Purpose of the Study:

  • To investigate how visual feedback delay and cognitive load affect postural control.
  • To differentiate the influence of visual and cognitive factors on different timescales of postural sway.
  • To examine the relationship between cognitive task performance and postural sway variability.

Main Methods:

  • Participants performed a balance task under eyes-open and delayed visual feedback conditions.
  • Delayed visual feedback was applied at various intervals (0-1200ms).

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  • A serial arithmetic task imposed cognitive load, and sway variability was analyzed using frequency filtering (0.3Hz) of Center of Pressure (COP) trajectories.

    • Main Results:

    • Delayed visual feedback increased sway variability across both low (slow) and high (fast) frequency components.
    • Cognitive task performance specifically affected the high-frequency (fast) sway components.
    • Vision predominantly influenced low-frequency sway, while cognitive load impacted fast sway.

    Conclusions:

    • Postural control involves distinct mechanisms operating at different timescales.
    • Visual feedback is critical for regulating slow postural sway.
    • Cognitive load modulates rapid adjustments in postural control, particularly under visual perturbation.