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Related Experiment Videos

Postural coordination in looking and tracking tasks.

Olivier Oullier1, Benoît G Bardy, Thomas A Stoffregen

  • 1Mouvement and Perception, Université de la Méditerranée, Marseille, France. oullier@walt.ccs.fau.edu

Human Movement Science
|August 9, 2002
PubMed
Summary
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Postural coordination modes emerged during visual-vestibular tasks. While both looking and tracking tasks showed similar hip-ankle coordination, tracking tasks exhibited more prominent in-phase and anti-phase modes.

Area of Science:

  • Human movement science
  • Neuroscience
  • Biomechanics

Background:

  • Previous research has identified stable coordination modes of hip and ankle joints during a target tracking task in a moving room.
  • Postural control relies on integrating visual and vestibular information for maintaining balance.

Purpose of the Study:

  • To investigate the effect of task variation (tracking vs. looking) on postural coordination modes.
  • To determine how different frequencies of room motion influence hip-ankle coordination.
  • To compare the coupling between room motion and head motion across tasks.

Main Methods:

  • Participants performed two tasks: looking at a stationary target or tracking a moving target in a room that oscillated at frequencies from 0.10 to 0.75 Hz.
  • Postural coordination of hip and ankle joints was analyzed.

Related Experiment Videos

  • The coupling between room motion and head motion was quantified.

    • Main Results:

    • Both tracking and looking tasks elicited in-phase and anti-phase postural coordination modes, with modes being more pronounced during tracking.
    • The specific coordination mode adopted was dependent on the frequency of room motion for both tasks.
    • Head-room motion coupling was significantly stronger in the tracking task compared to the looking task.

    Conclusions:

    • Hip-ankle coordination dynamics are qualitatively similar during visual-vestibular tasks, regardless of whether the participant is tracking or merely looking at a target.
    • The findings suggest that visual regulation of stance may involve generalizable coordination principles applicable to both active tracking and passive viewing.
    • These results contribute to a broader understanding of the visual control of posture and balance.