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Related Experiment Videos

Spatial invariance in anticipatory orienting behaviour during human navigation.

Pascal Prévost1, Yuri Ivanenko, Renato Grasso

  • 1LPPA, Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France. pascal.prevost@college-de-france.fr

Neuroscience Letters
|March 14, 2003
PubMed
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Humans anticipate turns by moving their heads before reaching a corner. This anticipatory head movement occurs at a constant distance, not time, regardless of vision, suggesting landmark-based navigation.

Area of Science:

  • Human movement science
  • Neuroscience
  • Biomechanics

Background:

  • Head orientation anticipates trajectory changes in walking.
  • This anticipatory behavior occurs 500 ms before a 90-degree turn, in both light and dark conditions.

Purpose of the Study:

  • To investigate how visual conditions and walking speed affect anticipatory head orientation before turning.
  • To determine if anticipatory head movements are time- or distance-based.

Main Methods:

  • Experiment 1: Compared anticipatory head movements with and without vision during corner negotiation.
  • Experiment 2: Assessed anticipatory head movements at varying walking speeds with eyes open.

Main Results:

  • Visual conditions did not significantly alter anticipatory head deviation.

Related Experiment Videos

  • Head deviation initiated at a constant distance to the corner, not a constant time, when walking speed varied.
  • Anticipatory orienting behavior appears independent of optic flow, suggesting landmark or egocentric cues.

    • Conclusions:

    • Anticipatory head movements during turning are primarily guided by distance-based cues, possibly landmarks or egocentric reference frames.
    • Findings challenge optic flow theories for guiding walking direction in complex trajectories.
    • Future research should explore the interplay of visual and non-visual cues in spatial navigation.