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Related Experiment Videos

Steering behaviour can be modulated by different optic flows during walking.

Guillaume Sarre1, Jessica Berard, Joyce Fung

  • 1Jewish Rehabilitation Hospital Research Site of CRIR, School of Physical & Occupational Therapy, McGill University, Montréal, Quebec, Canada.

Neuroscience Letters
|April 11, 2008
PubMed
Summary
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Visual motion patterns significantly influence steering during locomotion. Optic flow, especially rotational components, guides body movements and corrects trajectory, highlighting vision's crucial role in navigation.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Visual Perception

Background:

  • Optic flow, a pattern of visual motion, is known to control locomotion.
  • Previous research focused on discriminating translational or rotational optic flows.
  • The role of optic flow in steering during locomotion remains largely unknown.

Purpose of the Study:

  • To investigate how different optic flow patterns (rotational, translational, combined) affect steering behavior.
  • To compare steering responses based on the location of the focus of expansion (FOE).
  • To understand the influence of visual motion on locomotion control.

Main Methods:

  • Ten healthy young subjects walked in a virtual environment using a head-mounted display.
  • Subjects were exposed to varying optic flows with eccentric FOE locations.

Related Experiment Videos

  • Recorded body's center of mass (CoM) trajectory and body segment rotations in physical and virtual worlds.

    • Main Results:

    • Subjects exhibited mediolateral CoM shifts opposite to the FOE, increasing with eccentricity.
    • Rotational optic flows induced head and body segment reorientations.
    • Physical CoM corrections were small, resulting in virtual world deviations.

    Conclusions:

    • Vision, particularly optic flow patterns, profoundly influences steering during locomotion.
    • Rotational optic flow components are critical for orienting the body.
    • Discrepancies between physical and virtual world movements suggest limitations in real-time steering adjustments.