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Related Experiment Videos

Distraction affects the performance of obstacle avoidance during walking.

V Weerdesteyn1, A M Schillings, G P van Galen

  • 1Department of Biophysics, Univeristy of Nijmegen, Sint Maartenskliniek-Research, PO Box 9011, 6500 GM Nijmegen, The Netherlands. v.weerdesteyn@smk-research.nl

Journal of Motor Behavior
|May 2, 2003
PubMed
Summary

Divided attention impairs obstacle avoidance during walking. Young adults showed higher failure rates and slower, stiffer leg movements when performing a cognitive task simultaneously, highlighting the impact of dual-task interference on motor control.

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Area of Science:

  • Human motor control
  • Cognitive neuroscience
  • Biomechanics

Background:

  • Obstacle avoidance is a critical aspect of human locomotion.
  • Dual-task interference, where performing a cognitive task affects a motor task, is not fully understood in complex movements like obstacle negotiation.

Purpose of the Study:

  • To investigate the effects of dual-task interference on obstacle-avoidance performance in healthy young adults.
  • To analyze kinematic parameters and failure rates during single-task versus dual-task obstacle avoidance.

Main Methods:

  • Ten healthy young adults walked on a treadmill while encountering a falling obstacle.
  • Participants performed obstacle avoidance as a single task and concurrently with a cognitive secondary task (dual task).
  • Failure rates, avoidance strategies, and kinematic parameters (e.g., limb velocity, stiffness) were recorded.

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Main Results:

  • Higher failure rates were observed during the dual-task condition compared to the single-task condition, especially with limited response time.
  • Crossing swing limb velocities were reduced during dual-tasking.
  • Increased limb stiffness was identified as a contributing factor to the altered movement patterns.

Conclusions:

  • Divided attention significantly impairs obstacle-avoidance performance in healthy young adults.
  • Cognitive load during dual-tasking leads to changes in gait kinematics, specifically reduced limb velocity and increased stiffness.
  • These findings underscore the vulnerability of complex motor tasks to attentional demands.