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Related Experiment Videos

Posture and mental task performance when viewing a moving visual field.

Tanja Ehrenfried1, Michel Guerraz, Kai V Thilo

  • 1Department of Psychology, University of Halle, Am Steintor 18, 06112 Halle, Germany.

Brain Research. Cognitive Brain Research
|May 24, 2003
PubMed
Summary
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Whole field visual motion increases body sway and cognitive task errors. Performing cognitive tasks while standing still reduces body sway, suggesting attention diversion from postural control to cognitive tasks.

Area of Science:

  • Human movement science
  • Cognitive neuroscience
  • Sensory integration

Background:

  • Whole field visual motion can affect postural stability and cognitive performance.
  • Understanding the interplay between visual stimuli, posture, and cognition is crucial for various applications, including virtual reality and aviation.

Purpose of the Study:

  • To investigate how whole field visual motion impacts standing posture and concurrent cognitive task performance.
  • To explore the relationship between visual disorientation susceptibility and cognitive errors.

Main Methods:

  • 12 subjects performed spatial and verbal tasks in quiet stance while viewing a moving visual field at varying speeds.
  • Center of pressure (COP) and head movements were recorded.
  • 8 subjects were tested seated to control for stance effects.

Related Experiment Videos

  • Heart rate and eye movements monitored task load and viewing compliance.

    • Main Results:

    • Visual motion increased body sway (COP and head movements) in proportion to flow speed.
    • Cognitive tasks, when performed during visual motion, attenuated body sway.
    • Cognitive task errors significantly increased (>250%) during visual motion, regardless of posture (standing or seated).
    • Susceptibility to visual disorientation did not correlate with task error rates.

    Conclusions:

    • Visual motion may enhance sway as an exploratory mechanism to detect self-motion, rather than solely due to destabilization.
    • Cognitive tasks may reduce sway by diverting attention from postural control, decreasing exploratory movements.
    • Passive viewing of moving visual fields can interfere with cognitive tasks by diverting attentional resources due to perceived disorientation risk.