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Action strategies for walking through multiple, misaligned apertures.

Amy L Hackney1, Michael E Cinelli2, James S Frank3

  • 1Department of Kinesiology, University of Waterloo, Canada; Southern Ontario Smart Computing Innovation Program, University of Toronto, Canada.

Acta Psychologica
|November 21, 2017
PubMed
Summary
This summary is machine-generated.

Goal attraction, not aperture center, guides path selection during obstacle avoidance. Individuals adjust spatial margins and rotate shoulders when crossing misaligned apertures to maintain a straight trajectory.

Keywords:
Aperture crossingGaitGoal-directed locomotionObstacle avoidanceVisual control of locomotion

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Area of Science:

  • Human movement science
  • Robotics
  • Biomechanics

Background:

  • Path selection is generally attributed to end-goal attraction.
  • For aperture crossing, the precise origin of this attraction point (aperture center vs. end-goal) remains debated.
  • Previous studies often aligned apertures with the end-goal, limiting the investigation of attraction point origin.

Purpose of the Study:

  • To determine if the attraction point for aperture crossing behavior originates from the aperture's center or the end-goal.
  • To investigate how humans navigate misaligned apertures during locomotion.

Main Methods:

  • Participants walked through three apertures of varying sizes (0.9x, 1.3x, 1.7x shoulder width) and midline displacements (0, 25, 50, 75cm).
  • The first and last apertures were fixed at 0.9x or 1.7x shoulder width.
  • Crossing behavior, spatial margin, and body rotations were analyzed.

Main Results:

  • End-goal attraction, not the aperture's center, dictated path selection.
  • Spatial margins decreased with increasing aperture displacement from the midline.
  • Body rotations increased as apertures shifted further from the midline, irrespective of aperture size.

Conclusions:

  • Locomotion path is primarily guided by the end-goal's attraction.
  • Humans adapt by reducing spatial margins and rotating shoulders when navigating misaligned apertures.
  • These adaptations aim to maintain the straightest possible path toward the goal.