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Related Experiment Video

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Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
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Visual vigilance performance and standing posture at sea.

Yawen Yu1, Jane R Yank, Yasunobu Katsumata

  • 1University of Minnesota, Minneapolis, MN, USA.

Aviation, Space, and Environmental Medicine
|April 10, 2010
PubMed
Summary
This summary is machine-generated.

Crewmembers’ stance width and visual task difficulty affect balance and visual performance at sea. Narrower stances and easier tasks improved visual performance and reduced postural sway, demonstrating a link between posture and vision in maritime environments.

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Area of Science:

  • Human Factors
  • Maritime Ergonomics
  • Applied Physiology

Background:

  • Land-based studies show visual tasks influence stance control and vice-versa.
  • Shipboard environments require crew to manage motion while optimizing visual tasks.
  • The interplay between visual tasks and postural control at sea remains undemonstrated.

Purpose of the Study:

  • To investigate the mutual influence of visual tasks and postural control in a maritime setting.
  • To determine how stance width and visual task difficulty affect crew performance and posture at sea.

Main Methods:

  • Crewmembers stood on a force plate to measure center of pressure (COP) variability.
  • Stance width was varied (5 cm, 17 cm, 30 cm).
  • Visual vigilance tasks of varying difficulty (Easy vs. Hard) were used, alongside visual performance and workload assessments.

Main Results:

  • Visual performance was significantly better on the Easy task compared to the Hard task.
  • Subjective mental workload was higher for the Hard visual task.
  • Postural activity variability was greater during the Easy task; stance width modulated posture and influenced visual performance.
  • Postural activity dynamics shifted over days at sea.

Conclusions:

  • Stance width variations can modulate standing posture.
  • Stance width influences the performance of computer-based visual tasks in mild seas.
  • Findings highlight the interconnectedness of posture and visual function for maritime crew.